Carat Natural

Carat Natural

BT3 Loose gemstone approx 064 carat blue topaz natural Emerald cut gem stone
BT3 Loose gemstone approx 064 carat blue topaz natural Emerald cut gem stone
Paypal   US $2.99
3 Carat White E SI Certified Round 100 Natural Loose Diamond
3 Carat White E SI Certified Round 100 Natural Loose Diamond
Paypal   US $14,112.00
100 CARATS MIXED GEM NATURAL LOOSE GEMSTONE MIX LOT JEWELS GEMSTONES WHOLESALE
100 CARATS MIXED GEM NATURAL LOOSE GEMSTONE MIX LOT JEWELS GEMSTONES WHOLESALE
Paypal   US $22.50
BT6 blue topaz Marquise cut Natural gem stone approx 027 carat loose gem stone
BT6 blue topaz Marquise cut Natural gem stone approx 027 carat loose gem stone
Paypal   US $4.30
15 ct Carat H VS Natural Certified Round Brilliant 100 Eye Clean Loose Diamond
15 ct Carat H VS Natural Certified Round Brilliant 100 Eye Clean Loose Diamond
Paypal   US $5,168.00
6649 CARAT NATURAL INDIA SAPPHIRE VALUE 332 Euro
6649 CARAT NATURAL INDIA SAPPHIRE VALUE 332 Euro
Paypal   US $14.99
16327 CARAT NATURAL BRAZIL EMERALD VALUE 816 Euro
16327 CARAT NATURAL BRAZIL EMERALD VALUE 816 Euro
Paypal   US $39.99
C1 Citrine Round cut 020 carat loose gemstone gem stone stone natural
C1 Citrine Round cut 020 carat loose gemstone gem stone stone natural
Paypal   US $3.15
B21 Blue Topaz Oval cut 05 carat loose gem stone stone natural rock gemstone
B21 Blue Topaz Oval cut 05 carat loose gem stone stone natural rock gemstone
Paypal   US $3.20
176 ct Carat Natural Round G VS2 Genuine Loose Diamond with Certificate
176 ct Carat Natural Round G VS2 Genuine Loose Diamond with Certificate
Paypal   US $5,808.00
P51 Peridot Trilliant cut Approx 05 carats gem stone stone natural rock loose
P51 Peridot Trilliant cut Approx 05 carats gem stone stone natural rock loose
Paypal   US $3.25
2 CARAT EMERALD TOP QUALITY NATURAL GENUINE COLOMBIAN 14k WG SOLITAIRE RING $2k
2 CARAT EMERALD TOP QUALITY NATURAL GENUINE COLOMBIAN 14k WG SOLITAIRE RING $2k
Paypal   US $999.99
Genuine natural black spinel ring sterling silver 238 carats trillion size 7
Genuine natural black spinel ring sterling silver 238 carats trillion size 7
Paypal   US $47.95
15 Carat G SI Natural Certified Round Loose Diamond For Engagement Ring
15 Carat G SI Natural Certified Round Loose Diamond For Engagement Ring
Paypal   US $3,490.00
Solid 925 Sterling Silver Rhodium Ring Natural Amethyst 221 Carats Color cross
Solid 925 Sterling Silver Rhodium Ring Natural Amethyst 221 Carats Color cross
Paypal   US $19.18
LOOSE GEMS ★ 100 CARATS NATURAL MIXED FACETED CUT GEMSTONES
LOOSE GEMS ★ 100 CARATS NATURAL MIXED FACETED CUT GEMSTONES
Paypal   US $29.95
164 carat G SI1 Natural Certified Radiant Cut Loose Diamond Eye Clean
164 carat G SI1 Natural Certified Radiant Cut Loose Diamond Eye Clean
Paypal   US $3,740.00
11 Carat E VS Natural Earth Mined Certified Loose Diamond for Engagement Ring
11 Carat E VS Natural Earth Mined Certified Loose Diamond for Engagement Ring
Paypal   US $3,195.00
110 Carat Round E VS Natural Polished Loose Diamond for Engagement Ring
110 Carat Round E VS Natural Polished Loose Diamond for Engagement Ring
Paypal   US $3,051.00
G71 Loose gemstone Approx 145 carats Pear cut Garnet loose gemstone natural
G71 Loose gemstone Approx 145 carats Pear cut Garnet loose gemstone natural
Paypal   US $9.92
51 Oz 1446g 723 carats Beautiful Natural Black Tourmaline 4 pc
51 Oz 1446g 723 carats Beautiful Natural Black Tourmaline 4 pc
Paypal   US $14.99
ALL NATURAL BI COLORED AMETRINE FACETED TUMBLE NUGGET BEADS 88 CARAT 22
ALL NATURAL BI COLORED AMETRINE FACETED TUMBLE NUGGET BEADS 88 CARAT 22
Paypal   US $9.95
ALL NATURAL BI COLORED AMETRINE FACETED TUMBLE NUGGET BEADS 113 CARAT 24
ALL NATURAL BI COLORED AMETRINE FACETED TUMBLE NUGGET BEADS 113 CARAT 24
Paypal   US $9.95
BT9 Oval cut blue topaz Loose gem stone approx 141 carat blue topaz Natural
BT9 Oval cut blue topaz Loose gem stone approx 141 carat blue topaz Natural
Paypal   US $9.90
G21 Oval cut natural Approx085 carats gem stone garnet stone rock loose
G21 Oval cut natural Approx085 carats gem stone garnet stone rock loose
Paypal   US $3.15
BT4 Loose Emerald cut gem stone approx 124 carat blue topaz natural gemstone
BT4 Loose Emerald cut gem stone approx 124 carat blue topaz natural gemstone
Paypal   US $9.97
100 CARATS NATURAL LOOSE MIXED FACETED GEM GEMSTONES JEWELS
100 CARATS NATURAL LOOSE MIXED FACETED GEM GEMSTONES JEWELS
Paypal   US $29.95
BO5 Sparkling Black Onyx Pear cut loose gemstone natural approx 371 carats
BO5 Sparkling Black Onyx Pear cut loose gemstone natural approx 371 carats
Paypal   US $10.10
100 CARATS LOOSE MIXED JEWELS GEMSTONES ★ 100 NATURAL COLLECT INVESTMENT
100 CARATS LOOSE MIXED JEWELS GEMSTONES ★ 100 NATURAL COLLECT INVESTMENT
Paypal   US $29.95
10K Gold NATURAL Pink TOURMALINE ring 3 Carat 75 Grams SZ 11
10K Gold NATURAL Pink TOURMALINE ring 3 Carat 75 Grams SZ 11
Paypal   US $175.00
Natural 1 2 Carat Diamond 14K White Gold Bridal Ring 1013 RDB 102999
Natural 1 2 Carat Diamond 14K White Gold Bridal Ring 1013 RDB 102999
Paypal   US $1,331.55
Natural Raw Rough Diamonds 2025 carat Light Color Beads
Natural Raw Rough Diamonds 2025 carat Light Color Beads
   US $39.47
16 Carat H SI Natural Certified Princess Loose Diamond For Engagement Ring
16 Carat H SI Natural Certified Princess Loose Diamond For Engagement Ring
Paypal   US $2,845.00
2 Carat SI1 Natural Certified Round Loose Diamond For Engagement Ring
2 Carat SI1 Natural Certified Round Loose Diamond For Engagement Ring
Paypal   US $3,500.00
Natural 40 carats Brazilian emerald gem stone EJ 40
Natural 40 carats Brazilian emerald gem stone EJ 40
Paypal   US $139.00
15 Carat G Color Real Natural Certified Round Loose Diamond Excellent Cut
15 Carat G Color Real Natural Certified Round Loose Diamond Excellent Cut
Paypal   US $2,140.00
Natural 1 3 Carat Diamond Stud 14K White Gold Earrings 1013 EDS 018735
Natural 1 3 Carat Diamond Stud 14K White Gold Earrings 1013 EDS 018735
Paypal   US $620.68
GEMS ★ 100 CARATS NATURAL LOOSE MIXED FACETED CUT GEMSTONES ★
GEMS ★ 100 CARATS NATURAL LOOSE MIXED FACETED CUT GEMSTONES ★
Paypal   US $29.95
900 ct Loose Natural GREEN EMERALD HUGE 9 CARATS WOW
900 ct Loose Natural GREEN EMERALD HUGE 9 CARATS WOW
Paypal   US $280.49
Loose Diamond 303 Carat G VS2 Natural Certified GIA Round For Engagement Ring
Loose Diamond 303 Carat G VS2 Natural Certified GIA Round For Engagement Ring
Paypal   US $65,900.00
Natural 1 2 Carat Diamond Stud 14K Yellow Gold Earrings 1013 EDS 018743
Natural 1 2 Carat Diamond Stud 14K Yellow Gold Earrings 1013 EDS 018743
Paypal   US $1,381.05
Natural 2 Carat Tanzanite Sterling Silver Bow Necklace 1013 NCY 110523
Natural 2 Carat Tanzanite Sterling Silver Bow Necklace 1013 NCY 110523
Paypal   US $240.57
101 Carat Natural Round Brilliant Cut D VS2 Loose Diamond with Certificate
101 Carat Natural Round Brilliant Cut D VS2 Loose Diamond with Certificate
Paypal   US $3,009.00
109 ct CARAT G SI Natural Certified Princess Cut Loose Diamond
109 ct CARAT G SI Natural Certified Princess Cut Loose Diamond
Paypal   US $2,178.00
INTENSE FANCY YELLOW RARE COLOR CLEAN DIAMOND GENUINE DIAMOND NATURAL 019 CARAT
INTENSE FANCY YELLOW RARE COLOR CLEAN DIAMOND GENUINE DIAMOND NATURAL 019 CARAT
Paypal   US $300.00
ROUGH DIAMOND CLEAN FLAWLESS 021 CARAT NATURAL DIAMOND UNCUT BEAUTIFUL GEMSTONE
ROUGH DIAMOND CLEAN FLAWLESS 021 CARAT NATURAL DIAMOND UNCUT BEAUTIFUL GEMSTONE
Paypal   US $280.00
FANCY YELLOW RARE COLOR NATURAL DIAMOND CLEAN FLAWLESS HIGH VALUE 018 CARAT
FANCY YELLOW RARE COLOR NATURAL DIAMOND CLEAN FLAWLESS HIGH VALUE 018 CARAT
Paypal   US $340.00
101 CARAT ct E I1 Natural Certified Princess Loose Diamond for Ring
101 CARAT ct E I1 Natural Certified Princess Loose Diamond for Ring
Paypal   US $809.10
151 Carat G SI Natural Certified Round Loose Diamond for Ring
151 Carat G SI Natural Certified Round Loose Diamond for Ring
Paypal   US $5,062.50
1 ct Carat Round Brilliant D VS Natural Certified Diamond for Engagement Ring
1 ct Carat Round Brilliant D VS Natural Certified Diamond for Engagement Ring
Paypal   US $3,021.00
Amethyst Brazillian all natural clean gemstone 8x6mm VS 110 carats
Amethyst Brazillian all natural clean gemstone 8x6mm VS 110 carats
Paypal   US $9.99
103 Carat E SI Natural Certified Round Ideal Cut Loose Diamond
103 Carat E SI Natural Certified Round Ideal Cut Loose Diamond
Paypal   US $2,330.00
115 ct CARAT H SI Natural Certified Princess Excellent Cut Loose Diamond
115 ct CARAT H SI Natural Certified Princess Excellent Cut Loose Diamond
Paypal   US $2,592.00
212 ct CARAT I SI Natural Certified Round Excellent Cut Genuine Loose Diamond
212 ct CARAT I SI Natural Certified Round Excellent Cut Genuine Loose Diamond
Paypal   US $5,454.00
300 Carat Natural Diamond SI 2 Clarity Enhanced Color E
300 Carat Natural Diamond SI 2 Clarity Enhanced Color E
Paypal   US $5,500.00
One CaratSparkling Natural Rare LARGE Black Drilled Rough Diamond Lot FREE SHIP
One CaratSparkling Natural Rare LARGE Black Drilled Rough Diamond Lot FREE SHIP
Paypal   US $7.99
MATCHED PAIR OF NATURAL COLOMBIAN EMERALDS 8X6MM OVALS APPROX 90 CARATS EACH
MATCHED PAIR OF NATURAL COLOMBIAN EMERALDS 8X6MM OVALS APPROX 90 CARATS EACH
Paypal   US $132.00
115 CARAT ROUND E VS2 100 NATURAL CERTIFIED LOOSE DIAMOND CT
115 CARAT ROUND E VS2 100 NATURAL CERTIFIED LOOSE DIAMOND CT
Paypal   US $3,176.00
GEM DIAMOND IS FOREVER 019 CARAT UNCUT ROUGH NATURAL DIAMOND PRECIOUS GEMSTONE
GEM DIAMOND IS FOREVER 019 CARAT UNCUT ROUGH NATURAL DIAMOND PRECIOUS GEMSTONE
Paypal   US $300.00
100 CARATS NATURAL LOOSE MIXED FACETED GEM GEMSTONES
100 CARATS NATURAL LOOSE MIXED FACETED GEM GEMSTONES
Paypal   US $29.95
Brilliant 108 Carat carot H SI2 Certified Natural Round Loose Diamond 661mm
Brilliant 108 Carat carot H SI2 Certified Natural Round Loose Diamond 661mm
Paypal   US $1,617.00
100 CARATS NATURAL FACETED GEM GEMSTONES ★ LOOSE MIX CUT
100 CARATS NATURAL FACETED GEM GEMSTONES ★ LOOSE MIX CUT
Paypal   US $29.95
NATURAL DIAMOND JET BLACK COLOR 379 CARAT 920 MM for Queen SJ200
NATURAL DIAMOND JET BLACK COLOR 379 CARAT 920 MM for Queen SJ200
Paypal   US $349.00
Natural black diamond AAA 229 CARAT 835 MM Very good for engagement SJ204
Natural black diamond AAA 229 CARAT 835 MM Very good for engagement SJ204
Paypal   US $179.00
Huge Sale NATURAL DIAMOND JET BLACK 210 CARAT 822 MM SJ190
Huge Sale NATURAL DIAMOND JET BLACK 210 CARAT 822 MM SJ190
Paypal   US $149.00
ONE IN LIFE TIME SALE NATURAL DIAMOND JET BLACK OPAQUE 296 CARAT su62
ONE IN LIFE TIME SALE NATURAL DIAMOND JET BLACK OPAQUE 296 CARAT su62
Paypal   US $229.00
GENUINE DIAMOND 037CARAT WHITE VS HIGH END MINE FRESH NATURAL DIAMOND UNCUT GEM
GENUINE DIAMOND 037CARAT WHITE VS HIGH END MINE FRESH NATURAL DIAMOND UNCUT GEM
Paypal   US $400.00
55 CARAT CUSHION E VS1 100 NATURAL CERTIFIED LOOSE DIAMOND CT
55 CARAT CUSHION E VS1 100 NATURAL CERTIFIED LOOSE DIAMOND CT
Paypal   US $50,761.00
166 Carat I Top Light Brown VS2 Natural Certified Round Loose Diamond
166 Carat I Top Light Brown VS2 Natural Certified Round Loose Diamond
Paypal   US $3,239.10
110 CARAT ct I SI Natural Certified Round Loose Diamond for Ring
110 CARAT ct I SI Natural Certified Round Loose Diamond for Ring
Paypal   US $931.50
Wonderful 2490Carat Natural Green Emerald Loose Gemstone
Wonderful 2490Carat Natural Green Emerald Loose Gemstone
Paypal   US $.99
CERTIFIED 161 CARAT F VS1 ROUND LOOSE NATURAL DIAMOND FOR RING 741X745MM
CERTIFIED 161 CARAT F VS1 ROUND LOOSE NATURAL DIAMOND FOR RING 741X745MM
Paypal   US $5,499.99
11 CT CARAT E VS2 ROUND NATURAL CERTIFIED LOOSE DIAMOND
11 CT CARAT E VS2 ROUND NATURAL CERTIFIED LOOSE DIAMOND
Paypal   US $3,017.00
112 Carat Round Cut D color VS Natural Loose Diamond Build Your Own Ring
112 Carat Round Cut D color VS Natural Loose Diamond Build Your Own Ring
Paypal   US $3,801.00
007 Carat D SI1 Round Buy Loose Natural Diamond For Ring 258 164mm
007 Carat D SI1 Round Buy Loose Natural Diamond For Ring 258 164mm
Paypal   US $.01
279 CARAT ROUND G VS2 100 NATURAL CERTIFIED LOOSE DIAMOND CT
279 CARAT ROUND G VS2 100 NATURAL CERTIFIED LOOSE DIAMOND CT
Paypal   US $12,207.00
455 CARAT NATURAL UNTREATED RED RUBY GEMSTONE FROM INDIA
455 CARAT NATURAL UNTREATED RED RUBY GEMSTONE FROM INDIA
   US $1.67
INTENSE FANCY YELLOW RARE COLOR VS DIAMOND GENUINE DIAMOND NATURAL 028 CARAT
INTENSE FANCY YELLOW RARE COLOR VS DIAMOND GENUINE DIAMOND NATURAL 028 CARAT
Paypal   US $300.00
845 CARAT SPARKLING NATURAL UNTREATED SUNSTONE CATS EYE GEMSTONE
845 CARAT SPARKLING NATURAL UNTREATED SUNSTONE CATS EYE GEMSTONE
   US $3.32
1 CARAT PEAR F VS2 100 NATURAL CERTIFIED LOOSE DIAMOND CT
1 CARAT PEAR F VS2 100 NATURAL CERTIFIED LOOSE DIAMOND CT
Paypal   US $2,058.00
255 ct CARAT G SI Natural Certified Round Excellent Cut Genuine Loose Diamond
255 ct CARAT G SI Natural Certified Round Excellent Cut Genuine Loose Diamond
Paypal   US $6,903.00
1225 CARAT NATURAL UNTREATED SPARKLING MOONSTONE GEMSTONE
1225 CARAT NATURAL UNTREATED SPARKLING MOONSTONE GEMSTONE
   US $2.97
RUBY RUBIES 100 CARATS GEMSTONE BLOWOUT 100 NATURAL HOBBY INVESTMENT
RUBY RUBIES 100 CARATS GEMSTONE BLOWOUT 100 NATURAL HOBBY INVESTMENT
Paypal   US $189.95
430 CARAT NATURAL UNTREATED BLUE SAPPHIRE GEMSTONE
430 CARAT NATURAL UNTREATED BLUE SAPPHIRE GEMSTONE
   US $9.18
053 carat NATURAL D VS1 Round Genuine Loose Diamond
053 carat NATURAL D VS1 Round Genuine Loose Diamond
Paypal   US $1,131.00
3035 CARAT NATURAL AMETHYST GEMSTONE OVAL SHAPE
3035 CARAT NATURAL AMETHYST GEMSTONE OVAL SHAPE
   US $1.56
3435 CARAT NATURAL SULEMANI STONE AQIQ HAKIK GEMSTONE
3435 CARAT NATURAL SULEMANI STONE AQIQ HAKIK GEMSTONE
   US $3.67
125 Carat Natural Most Beautiful ETHIOPIAN WELLO OPAL Gemstone
125 Carat Natural Most Beautiful ETHIOPIAN WELLO OPAL Gemstone
   US $6.42
2465 CARAT NATURAL MOST BEAUTIFUL AFRICAN TIGER EYE GEMSTONE
2465 CARAT NATURAL MOST BEAUTIFUL AFRICAN TIGER EYE GEMSTONE
   US $3.12
065 CT CARAT F VVS2 ROUND NATURAL CERTIFIED LOOSE DIAMOND
065 CT CARAT F VVS2 ROUND NATURAL CERTIFIED LOOSE DIAMOND
Paypal   US $1,269.00
4970 CARAT 12x16mm NATURAL AMETHYST GEMSTONE 5 Pcs
4970 CARAT 12x16mm NATURAL AMETHYST GEMSTONE 5 Pcs
   US $3.12
099 CARAT ROUND H SI1 100 NATURAL CERTIFIED LOOSE DIAMOND CT
099 CARAT ROUND H SI1 100 NATURAL CERTIFIED LOOSE DIAMOND CT
Paypal   US $1,652.00
Tourmaline Blue green VVS natural 15x55x37mm 324carats
Tourmaline Blue green VVS natural 15x55x37mm 324carats
Paypal   US $115.00
008 Carat J Color VVS1 Round Natural Loose Diamond For Ring 274 161mm
008 Carat J Color VVS1 Round Natural Loose Diamond For Ring 274 161mm
Paypal   US $18.50

Carat Natural

Natural Gemstones

However certain rocks, (such as lapis lazuli) and organic materials (such as amber or jet) are not minerals, but are still used for jewelry, and are therefore often considered to be  Natural Gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their lustre or other physical properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone. Apart from jewelry, from earliest antiquity until the 19th century engraved gems and hardstone carvings such as cups were major luxury art forms; the carvings of Carl Fabergé were the last significant works in this tradition.

 

The traditional classification in the West, which goes back to the Ancient Greeks, begins with a distinction between precious and semi-precious stones; similar distinctions are made in other cultures. In modern usage the precious stones are diamond, ruby, sapphire and emerald, with all other gemstones being semi-precious. This distinction is unscientific and reflects the rarity of the respective stones in ancient times, as well as their quality: all are translucent with fine color in their purest forms, except for the colorless diamond, and very hard, with hardnesses of 8-10 on the Mohs scale. Other stones are classified by their color, translucency and hardness. The traditional distinction does not necessarily reflect modern values, for example, while garnets are relatively inexpensive, a green garnet called Tsavorite, can be far more valuable than a mid-quality emerald. Another unscientific term for semi-precious gemstones used in art history and archaeology is hardstone. Use of the terms 'precious' and 'semi-precious' in a commercial context is, arguably, misleading in that it deceptively implies certain stones are intrinsically more valuable than others, which is not the case.

 

In modern times  Natural Gemstones are identified by gemologists, who describe gems and their characteristics using technical terminology specific to the field of gemology. The first characteristic a gemologist uses to identify a gemstone is its chemical composition. For example, diamonds are made of carbon (C) and rubies of aluminium oxide (Al2O3). Next, many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic. Another term used is habit, the form the gem is usually found in. For example diamonds, which have a cubic crystal system, are often found as octahedrons.

 

There are no universally accepted grading systems for any gemstone other than white (colorless) diamond. Diamonds are graded using a system developed by the Gemological Institute of America (GIA) in the early 1950s. Historically all gemstones were graded using the naked eye. The GIA system included a major innovation, the introduction of 10x magnification as the standard for grading clarity. Other <a href=" http://www.gemandgemstone.com "> Natural Gemstones </a> are still graded using the naked eye (assuming 20/20 vision).

 

A mnemonic device, the "four C's" (color, cut, clarity and carat), has been introduced to help the consumer understand the factors used to grade a diamond.[8] With modification these categories can be useful in understanding the grading of all gemstones. The four criteria carry different weight depending upon whether they are applied to colored gemstones or to colorless diamond. In diamonds, cut is the primary determinant of value followed by clarity and color. Diamonds are meant to sparkle, to break down light into its constituent rainbow colors (dispersion) chop it up into bright little pieces (scintillation) and deliver it to the eye (brilliance). In its rough crystalline form, a diamond will do none of these things, it requires proper fashioning and this is called "cut". In gemstones that have color, including colored diamonds, it is the purity and beauty of that color that is the primary determinant of quality.

 

Physical characteristics that make a colored stone valuable are color, clarity to a lesser extent (emeralds will always have a number of inclusions), cut, unusual optical phenomena within the stone such as color zoning, and asteria (star effects). The Greeks for example greatly valued asteria in gemstones, which were regarded as a powerful love charm, and Helen of Troy was known to have worn star-corundum.

 

Historically gemstones were classified into precious stones and semi-precious stones. Because such a definition can change over time and vary with culture, it has always been a difficult matter to determine what constitutes precious stones.

 

Diamond has a wide bandgap of 5.5 eV corresponding to the deep ultraviolet wavelength of 225 nanometers. This means pure diamond should transmit visible light and appear as a clear colorless crystal. Colors in diamond originate from lattice defects and impurities. The diamond crystal lattice is exceptionally strong and only atoms of nitrogen, boron and hydrogen can be introduced into diamond during the growth at significant concentrations (up to atomic percents). Transition metals Ni and Co, which are commonly used for growth of synthetic diamond by high-pressure high-temperature techniques, have been detected in diamond as individual atoms; the maximum concentration is 0.01% for Ni[24] and even much less for Co. Virtually any element can be introduced to diamond by ion implantation.

 

Nitrogen is by far the most common impurity found in gem diamonds. Nitrogen is responsible for the yellow and brown color in diamonds. Boron is responsible for the gray blue colors.Color in diamond has two additional sources: irradiation (usually by alpha particles), that causes the color in green diamonds; and plastic deformation of the diamond crystal lattice. Plastic deformation is the cause of color in some brown[26] and perhaps pink and red diamonds.In order of rarity, colorless diamond, by far the most common, is followed by yellow and brown, by far the most common colors, then by blue, green, black, translucent white, pink, violet, orange, purple, and the rarest, red. "Black", or Carbonado, diamonds are not truly black, but rather contain numerous dark inclusions that give the gems their dark appearance. Colored diamonds contain impurities or structural defects that cause the coloration, while pure or nearly pure diamonds are transparent and colorless. Most diamond impurities replace a carbon atom in the crystal lattice, known as a carbon flaw. The most common impurity, nitrogen, causes a slight to intense yellow coloration depending upon the type and concentration of nitrogen present.[20] The Gemological Institute of America (GIA) classifies low saturation yellow and brown diamonds as diamonds in the normal color range, and applies a grading scale from "D" (colorless) to "Z" (light yellow). Diamonds of a different color, such as blue, are called fancy colored diamonds, and fall under a different grading scale.

About the Author

I am Mohan read mathematics at Stanford and remained there for his MS. From 1998-1999 on researched in Evolution and in Animal Behavior in  Camrbidge, UK.


100 Carat All Natural Peridot Necklace


100 Carat All Natural Peridot Necklace


$17


A beautiful necklace featuring a beaded string of uncut natural peridot gemstones weighing 100 carats in total. The peridot are strung on an elastic string for a one size fits all design. A fun and stylish necklace. Resizable: No Adjustable: Yes Stone: Peridot Gender: Women Age: Adult

100 Carat All Natural Aquamarine Necklace


100 Carat All Natural Aquamarine Necklace


$17


A beautiful necklace featuring a beaded string of uncut natural aquamarine gemstones weighing 100 carats in total. The aquamarine are strung on an elastic string for a one size fits all design. A fun and stylish necklace. Resizable: No Adjustable: Yes Stone: Aquamarine Gender: Women Age: Adult

100 Carat All Natural Amethyst Necklace


100 Carat All Natural Amethyst Necklace


$17


A beautiful necklace featuring a beaded string of uncut natural amethyst gemstones weighing 100 carats in total. The amethyst are strung on an elastic string for a one size fits all design. A fun and stylish necklace. Resizable: No Adjustable: Yes Stone: Amethyst Gender: Women Age: Adult

100 Carat All Natural Blue Topaz Necklace


100 Carat All Natural Blue Topaz Necklace


$17


A beautiful necklace featuring a beaded string of uncut natural blue topaz gemstones weighing 100 carats in total. The blue topaz are strung on an elastic string for a one size fits all design. A fun and stylish necklace. Resizable: No Adjustable: Yes Stone: Topaz Gender: Women Age: Adult

100 Carat All Natural Citrine Necklace


100 Carat All Natural Citrine Necklace


$17


A beautiful necklace featuring a beaded string of uncut natural citrine gemstones weighing 100 carats in total. The citrine are strung on an elastic string for a one size fits all design. A fun and stylish necklace. Resizable: No Adjustable: Yes Stone: Citrine Gender: Women Age: Adult

7.0 Carat Donata Natural Ruby & Diamond Ring


7.0 Carat Donata Natural Ruby & Diamond Ring


$11421


An endearing symbol of love is represented by this gorgeous diamond and ruby ring. Its centralized focal point is the genuine oval ruby that has an astonishing weight of 5.0 carats. This all natural specimen has a beautiful color with a clean clarity. This awe-inspiring stone is enhanced by 2.0 carats of glittering baguette and princess cut diamonds. These diamonds surround the ruby like a blanket of ice. The diamonds have a clarity of Vs2-Si1 with a color range of H-I. The gorgeous, high polished setting is made of 14K white gold with a total gold weight of 8.63 grams.

1/2 Carat Natural 4MM Emerald Stud Earrings in .925 Sterling Silver


1/2 Carat Natural 4MM Emerald Stud Earrings in .925 Sterling Silver


$18.95


An enchanting pair of all natural, genuine emerald stud earrings set in durable .925 sterling silver basket settings. 2 round, faceted emeralds measure 4mm each and weigh .50 carat in total. Emeralds are a precious family stone and are among the most valuable gemstones on earth. The dazzling AA+ green emeralds have a beautiful green color with no major surface inclusions. Do to the natural origins of the stone, slight variation is color as well as minor inclusions will be visible if looked at from a very close distance. All stones are hand selected and matched. A wonderful pair of gemstone earrings, great for everyday wear. Brand: Szul Jewelry Style: Prong-Set Metal Stamp: .925 Sterling Silver Material: Sterling Silver Stone: Emerald Number of Stones: 2 Gender: Female Age: Adult

2.80 Carat Emerald & 2.91 Carat Diamond Ring


2.80 Carat Emerald & 2.91 Carat Diamond Ring


$16652


Feast your eyes on this awesome emerald and diamond ring that could make some lucky lady out there very happy! This monstrous ring consists of a natural square cut center Columbian emerald with a weight of 2.80 carats. This emerald has a beautiful deep color with natural inclusions that add to its character. Surrounding the emerald, there are beautiful baguette cut diamonds with a total weight of 1.80 carats. There are also .95 carats of marquise cut diamonds and .16 carats of round cut diamonds that complement this gorgeous ring. The diamonds range in clarity from Vs2-Si1 and have a color grade of H-I. This fabulous ring is made of 14K white gold with a total gold weight of 13.10 grams.

1.00 Carat t.w. Natural Diamond Cluster Ring In Sterling Silver


1.00 Carat t.w. Natural Diamond Cluster Ring In Sterling Silver


$355


In a commanding tapered design, natural 1.00 ct. t.w. diamonds glitter from rich black rhodium-finished settings. Sterling silver ring. Diamond birthstones are the perfect gift for April birthdays.

12.00 Carat Rutilated Quartz Ring In Sterling Silver


12.00 Carat Rutilated Quartz Ring In Sterling Silver


$146.25


Look closely at the stone -- threads of the mineral rutile create unique natural patterns within a 12.00 carat quartz. Sterling silver ring.

35 Carat All Natural Uncut Genuine Blue Topaz Bracelet


35 Carat All Natural Uncut Genuine Blue Topaz Bracelet


$17


A beautiful all natural blue topaz bracelet featuring 35 carats of uncut natural blue topaz strung on a stretch bracelet. A beautiful color stone accessory great for every day wear. The one size fits all is strung with deep and vibrant gemstones sure to be treasured and admired. Resizable: No Adjustable: Yes Stone: Topaz Gender: Women Age: Adult

35 Carat All Natural Uncut Genuine Aquamarine Bracelet Genuine


35 Carat All Natural Uncut Genuine Aquamarine Bracelet Genuine


$17


A beautiful all natural aquamarine bracelet featuring 35 carats of uncut natural garnet strung on a stretch bracelet. A beautiful color stone accessory great for every day wear. The one size fits all is strung with deep and vibrant gemstones sure to be treasured and admired. Stone: Aquamarine Gender: Women Age: Adult Resizable: Yes Adjustable: Yes

35 Carat All Natural Uncut Genuine Citrine Bracelet


35 Carat All Natural Uncut Genuine Citrine Bracelet


$17


A beautiful all natural citrine bracelet featuring 35 carats of uncut natural citrine strung on a stretch bracelet. A beautiful color stone accessory great for every day wear. The one size fits all is strung with deep and vibrant gemstones sure to be treasured and admired. Brand: Szul Jewelry Stone: Citrine Gender: Female Age: Adult Resizable: Yes Adjustable: Yes Condition: New

35 Carat All Natural Uncut Genuine Amethyst Bracelet


35 Carat All Natural Uncut Genuine Amethyst Bracelet


$17


A beautiful all natural amethyst bracelet featuring 35 carats of uncut natural amethyst strung on a stretch bracelet. A beautiful color stone accessory great for every day wear. The one size fits all is strung with deep and vibrant gemstones sure to be treasured and admired. Brand: Szul Jewelry Stone: Amethyst Gender: Female Age: Adult Resizable: Yes Adjustable: Yes Condition: New

35 Carat All Natural Uncut Genuine Peridot Bracelet


35 Carat All Natural Uncut Genuine Peridot Bracelet


$17


A beautiful all natural peridot bracelet featuring 35 carats of uncut natural peridot strung on a stretch bracelet. A beautiful color stone accessory great for every day wear. The one size fits all is strung with deep and vibrant gemstones sure to be treasured and admired. Brand: Szul Jewelry Stone: Peridot Gender: Female Age: Adult Resizable: Yes Adjustable: Yes Condition: New

2.20 Carat Sapphire & .44 Carat Diamond Ring


2.20 Carat Sapphire & .44 Carat Diamond Ring


$3117


This sensational gem and diamond ring has an elegant appearance that will enhance any wardrobe. It features a �massive center sapphire with a weight of 2.20 carats. This astounding�specimen�is genuine and natural with a clean clarity and awesome color. On the sides, there are .44 carats of beautiful baguette cut diamonds. These wonderful baguettes are a little longer than your average baguettes. They have a clarity of Vs1-Vs2 and a color range of G-H. This ring is made of 14K white gold and has a total gold weight of 4.96 grams.

2.50 Carat Emerald & .80 Carat Diamond Ring


2.50 Carat Emerald & .80 Carat Diamond Ring


$7647


This is a beautiful and very elegant emerald and diamond ring that would be the centerpiece of your jewelry collection. It consists of a genuine center square cut Columbian emerald with a massive weight of 2.50 carats. This emerald has a gorgeous color and natural inclusions that add to its character. On the side, there are .80 carats of beautiful baguette cut diamonds that complement this ring very nicely. These lively baguettes range in clarity from Vs2-Si1 and have a color grade of H-I. This ring is made of 14K white gold with a total gold weight of 6.08 grams.

8.70 Carat Jayne Natural Emerald & Invisible Diamond Ring


8.70 Carat Jayne Natural Emerald & Invisible Diamond Ring


$17932


This remarkable piece will make an ever-lasting impression on anyone who sees it. A natural emerald with an incredible weight of 5.60 carats is the pinnacle focal point. Its envious green shade is complemented by natural inclusions that are the characteristics of this genuine stone. Surrounding the top of the setting and half way down the shank are invisibly set princess cut diamonds. This sea of ice glitters with a total weight of 3.10 carats. These shimmering diamonds are Vs2-Si1 in clarity and H-I in color. The gorgeous hand made setting is fabricated in 18K white gold with a total gold weight of 13.21 grams.

2.85 Carat Sapphire & 1.09 Carat Ring


2.85 Carat Sapphire & 1.09 Carat Ring


$5376


This is one of the most beautiful gem rings you will ever see. The meticulous craftsmanship is evident everywhere. The main feature is the spectacular center oval cut sapphire with a weight of 2.85 carats. This fine specimen�is a natural stone and NOT lab created. The color is absolutely gorgeous with a clean clarity. Complementing the center sapphire, there are .69 carats of round cut diamonds and .40 carats of baguette cut diamonds. These beautiful diamonds have a clarity range of Vs2-Si1 and a color grade of H-I. This ring is not recommended for ladies with small fingers (size 6 and up). The ring is made of 14K yellow gold and has a total gold weight of 7.70 grams.

1.40 Carat Diamond & .35 Carat Ruby Ring


1.40 Carat Diamond & .35 Carat Ruby Ring


$4161


This sophisticated ring is gleaming with brilliance that can be seen from across the room. Its unique design compromises of a diamond shape design in the middle made of princess cut diamonds and rubies. There are a total of .30 carats of princess diamonds and .35 carats of natural red rubies in an invisible setting. This is a special setting in which you can not see how the stones are attached. The diamonds are Vs2-Si1 in clarity and the rubies have a beautiful color with clean clarity. Surrounding this design and on the shank, there are 1.10 carats of round cut diamonds. These round diamonds are VS2-Si1 in clarity and H-I in color. This ring is made of 18K yellow gold with a total gold weight of 7.79 grams.

2.50 Carat Ruby & 3.79 Carat Diamond Ring


2.50 Carat Ruby & 3.79 Carat Diamond Ring


$13020


This is a massive ruby and diamond ring that was not intended for the meek and humble to adorn them self with. It features an incredible center genuine oval cut ruby with a weight of 2 1/2 carats. This awesome ruby is beautiful in color and has natural inclusions that add to its character. Surrounding the ruby, there are .59 carats of round cut diamonds, plus a whooping 3.20 carats of beautiful baguette cut diamonds. These lively diamonds have a fabulous clarity range of Vs2-Si1 and a color grade of H-I. This gorgeous ring is made of 18K yellow gold with a total gold weight of 11.07 grams.

1/2 Carat Natural Round Sapphire and Diamond Ring in .925 Sterling Silver


1/2 Carat Natural Round Sapphire and Diamond Ring in .925 Sterling Silver


$44.9


An all natural 5mm round blue sapphire is prong set and surrounded by 4 sparkling genuine diamonds. The antique styled bead band is crafted in solid sterling silver. A one of a kind designer style natural gemstone and diamond ring that is sure to be treasured forever. The ring comes in a standard size 7 and can be resized by any local jeweler if necessary. Style: Prong-Set Resizable: Yes Adjustable: Yes Size/Dimensions: 7 Metal Stamp: .925 Sterling Silver Diamond Color: G-J Diamond Weight: 0.02 Shape: Round Oval

2.89 Carat Pear Emerald & .80 Carat Diamond Ring


2.89 Carat Pear Emerald & .80 Carat Diamond Ring


$5337


This huge emerald and diamond ring is very unique and interesting. It will definitely be a conversational piece. The centerpiece is an immense 2.89 carat pear shaped emerald. This is a genuine fine emerald and not lab created. The color is awesome as you can see from the picture. The clarity is clean with natural inclusions. On the side, there are .80 carats of beautiful baguette cut diamonds. These baguettes have a clarity of Vs2-Si1 and the color ranges from H-I. This magnificent ring is made of 14K yellow & white gold and has a total gold weight of 6.90 grams.

3.60 Carat Oval Sapphire & 1 Carat Diamond Ring


3.60 Carat Oval Sapphire & 1 Carat Diamond Ring


$6299


This is a gorgeous ring that features an incredible 3.60 carat center oval cut sapphire. This beautiful specimen is 100% natural and has a rich color with a clean clarity. The sapphire is complemented with by 1.0 carats of round and baguette cut diamonds. These diamonds have a clarity of VS2-Si1 and a color range of H-I. This ring is made of 14K white gold with a total gold weight of 6.13 grams.

35 Carat All Natural September Sapphire Necklace with Magnetic Clasp


35 Carat All Natural September Sapphire Necklace with Magnetic Clasp


$68


An 18 inch necklace featuring 2mm to 4mm all natural Sapphires double knotted with a magnetic clasp. A stunning strand that is great for formal and casual wear. Total weight of Sapphires is 30 carats. A beautiful gemstone necklace strand that is sure to be treasured. Brand: Szul Jewelry Resizable: No Adjustable: Yes Stone: Sapphire Gender: Female Age: Adult

Heart Diamond Pendant 10k Yellow Gold Charm Natural (0.10 Carat)


Heart Diamond Pendant 10k Yellow Gold Charm Natural (0.10 Carat)


$86


Necklace not Included. Can be purchased Seperately. .10CT Natural Heart Diamond Pendant Yellow Gold Charm. Diamond Heart Love Pendant Charm 10k Yellow Gold (1/10 ctw). Brand: Apex Jewels Design: Themed Style: Pendants Occasion: Birthday Metal Stamp: 10 kt Diamond Color: G-J Diamond Clarity: I1 clarity Diamond Weight: 0.10

35 Carat All Natural Emerald Necklace with Magnetic  Clasp


35 Carat All Natural Emerald Necklace with Magnetic Clasp


$57.5


An 18 inch necklace featuring 2mm to 4mm all natural Emeralds double knotted with a magnetic clasp. A stunning strand that is great for formal and casual wear. Total weight of the emeralds are 35 carats. A beautiful gemstone necklace strand that is sure to be treasured. Brand: Szul Jewelry Resizable: No Adjustable: Yes Stone: Emerald Gender: Female Age: Adult

20 Carat All Natural Beaded Ruby Bracelet with Magnetic Clasp


20 Carat All Natural Beaded Ruby Bracelet with Magnetic Clasp


$41.75


A beautiful piece featuring graduated all natural red rubies on this stylish one of a kind bracelet look. A minimum of 20 full carats make this piece an absolute gem of a bracelet. The bracelet secures with a magnetic clasp that is highliy secure and very convenient. The bracelet measures a standard 7 inches in length. A masterpiece that is sure to not only be cherished but be the highlight of any precious bracelet collection. Brand: Szul Jewelry Stone: Ruby Gender: Female Age: Adult Resizable: Yes Adjustable: Yes Condition: New

20 Carat All Natural Beaded Emerald Bracelet with Magnetic Clasp


20 Carat All Natural Beaded Emerald Bracelet with Magnetic Clasp


$41.75


A beautiful piece featuring graduated all natural red emeralds on this stylish one of a kind bracelet look. A minimum of 20 full carats make this piece an absolute gem of a bracelet. The bracelet secures with a magnetic clasp that is highliy secure and very convenient. The bracelet measures a standard 7 inches in length. A masterpiece that is sure to not only be cherished but be the highlight of any precious bracelet collection. Brand: Szul Jewelry Material: Silver Plated Stone: Emerald Gender: Female Age: Adult Resizable: Yes Adjustable: Yes Condition: New

2 Carat Natural Cabochon Ruby and Diamond Pendant in .925 Sterling Silver


2 Carat Natural Cabochon Ruby and Diamond Pendant in .925 Sterling Silver


$39.1


A rare all natural cabochon ruby is set under 3 sparkling white diamonds on this setting crafted in .925 sterling silver. A beautiful and unique piece. The pendant hangs from an 18 inch chain also crafted in .925 sterling silver. Style: Prong-Set Resizable: No Adjustable: Yes Metal Stamp: .925 Sterling Silver Diamond Color: G-J Diamond Weight: 0.04 Material: Sterling Silver Stone: Diamond

2.00 Carat All Natural Peridot and Diamond Bracelet in .925 Sterling Silver


2.00 Carat All Natural Peridot and Diamond Bracelet in .925 Sterling Silver


$59.6


8 4x3mm natural peridot stones are prong set on this antique engraved bracelet featuring 2 sparkling accent diamonds. the bracelet is set in sterling silver and displays top of the line workmanship and detail. The bracelet measures 7 inches in length and is rhodium plated, like white gold, to ensure the bracelet will not fade or tarnish. Style: Prong-Set Metal Stamp: .925 Sterling Silver Diamond Color: G-J Diamond Weight: 0.01 Material: Sterling Silver Stone: Diamond Number of Stones: 10+ Stone Shape: Round

100 Carat All Natural Uncut Pink Quartz Necklace with Magnetic Clasp


100 Carat All Natural Uncut Pink Quartz Necklace with Magnetic Clasp


$99


A beautiful Pink Quartz Beaded Necklace featuring 100 carats of all natural uncut pink quartz gemstones. A beautiful look featuring this season&#39;s hottest gemstone. The necklace secures with a magnetic clasp and measures approximately 18 inches in length. A fantastic summer inspired piece great for any occassion! Resizable: No Adjustable: Yes Stone: Quartz Gender: Women Age: Adult

2.50 Carat All Natural Oval Ruby Ring in .925 Sterling Silver


2.50 Carat All Natural Oval Ruby Ring in .925 Sterling Silver


$32.9


A stunning all natural 9x7mm precious oval red ruby is set on a sleek setting crafted in solid .925 sterling silver. The center ruby weighs 2.50 carats and is rated a AA+ stone featuring a deep red ruby color and no major surface inclusions. A beautiful genuine gemstone ring, perfect for every day wear. This item comes in a standard ring size 7 and can be resized by any local jeweler if neccessary. Brand: Szul Jewelry Style: Prong-Set Resizable: Yes Adjustable: Yes Size/Dimensions: 7 Metal Stamp: .925 Sterling Silver Shape: Round Oval Material: Sterling Silver

4.70 Carat Smoky Quartz Ring With Diamonds In Vermeil


4.70 Carat Smoky Quartz Ring With Diamonds In Vermeil


$185


This 4.70 carat smoky quartz and natural diamond ring makes a big statement for your next cocktail hour! Black-rhodiumed, sterling silver and vermeil* ring. *18kt gold-plated sterling silver.

4.50 Carat Square Cut Natural Emerald & Diamond Yellow Gold Ring


4.50 Carat Square Cut Natural Emerald & Diamond Yellow Gold Ring


$5366


Excitement lends its hand in the design of this gorgeous emerald and diamond ring. Its influential centerpiece glows with a mesmerizing green color hue that can only be found in a quality emerald. This beautiful square cut, natural emerald has an impressive size of 4.00 carats and will definitely turn some heads with its brilliance and colorful demeanor. Glittering down the shank of the ring are round cut diamonds that have a total combined weight of .50 carats. These precious diamonds have a clarity of Vs2-Si1 with a color grade of H-I. The ring has a unique Euro shank which adds to its distinctive design and gives the ring a more balanced weight between the top and bottom. This commanding piece measures 4mm wide at the shank and is made of 14kt. yellow gold with a total metal weight of 7.50 grams.

4.00 Carat All Natural Lemon Quartz Pendant in Sterling Silver


4.00 Carat All Natural Lemon Quartz Pendant in Sterling Silver


$114


A stunning all natural 14x12mm pear shaped lemon quartz with a checkerboard surface dangles around an exquisite frame crafted in .925 sterling silver weighing over 8 full grams. The sterling silver is rhodium plated to ensure the metal doesn;t tranish or fade the way unplated sterling silver often does. A lovely piece measuring 1.5 inches in length and 1 inch in width.A large look at an unbeatable price! The pendant hangs from a double strand rope chain also crafted in genuine sterling silver. A masterpiece great for casual and formal wear. Resizable: No Adjustable: Yes Metal Stamp: .925 Sterling Silver Material: Sterling Silver Number of Stones: 1 Gender: Women Age: Adult

3.58 Carat Sapphire & .65 Carat Diamond Flower Ring


3.58 Carat Sapphire & .65 Carat Diamond Flower Ring


$4380


This awesome gem and diamond ring has a very unique design and incorporates�quality craftsmanship. It features a massive center oval cut sapphire with a weight of 3.58 carat. This impressive sapphire is a genuine and natural stone that has a clean clarity and beautiful color. On the side, there are .50 carats of marquise cut diamonds and .15 carats of round cut diamonds. These diamonds are in a intricate setting that resembles a "flower". These diamonds have a clarity range of Vs2-Si1 and a color grade of H-I. This incredible ring is made of 14K white gold with a total gold weight of 5.23 grams.

4.00 Carat All-Natural Genuine 8x6 mm, Oval Ruby earrings set in 14k White Gold


4.00 Carat All-Natural Genuine 8x6 mm, Oval Ruby earrings set in 14k White Gold


$359


These wonderful Oval Ruby earrings are prong set in a royal 14k White Gold basket settings. The all natural large 8x6mm ruby gemstones weigh 2 carats each (4 Carat Total weight) and are hand selected and are rated as a AA Grade Ruby. The dazzling Ruby gemstones measure 8x6 mm in diameter and are prong set to perfection. This hand selected, high quality, all-natural genuine stones consist of a medium deep color and good clarity that is simply dazzling. The earrings come standard with push back Brand: Szul Jewelry Metal Stamp: 14 kt Material: White Gold Stone: Ruby Gender: Female Age: Adult Resizable: No Adjustable: No

3.66 Carat Anika Oval Sapphire & Diamond Ring


3.66 Carat Anika Oval Sapphire & Diamond Ring


$5088


This stunning sapphire and diamond ring will quickly become a family heirloom. Its center focal point is the 2.80 carat genuine sapphire. This natural stone has a beautiful color with a clean clarity. The sapphire is surrounded by 1.40 carat of sparkling baguette cut diamonds and round cut diamonds. The diamonds are Vs2-Si1 in clarity and H-I in color. This gorgeous ring is made of 14K white gold with a total gold weight of 4.35 grams.

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