Chrysoprase
Chrysoprase is the green variety of Chalcedony . Its color ranges from a light, minty... More
Chrysoprase is the green variety of Chalcedony. Its color ranges from a light, minty-green to a deep apple-green. The unique, rich color of Chrysoprase is caused by impurities of nickel, as this gemstone most frequently originates in nickel-rich Serpentine deposits. Hide
Chrysoprase GEMSTONE PHOTOS
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Chrysoprase IN THE ROUGH PHOTOS
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Citrine
Citrine is the yellow to orange variety of Quartz . Natural Citrine is not common mos... More
Citrine is the yellow to orange variety of Quartz. Natural Citrine is not common; most Citrine on the gem market is produced by heat treating Amethyst and Smoky Quartz. It takes a relatively low temperature to change the color light to golden yellow, and heating to higher temperatures will give the stone a darker yellow to brownish-red color. The name Citrine is derived from the citron fruit, a yellow fruit similar to the lemon. (In fact, citron means "lemon" in several languages.) Hide
Citrine IN THE ROUGH PHOTOS
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Copper
Copper is known for its metallic reddish brown color. Though not a gemstone or precio... More
Copper is known for its metallic reddish-brown color. Though not a gemstone or precious metal, it is included here in this guide for its historical significance as an ancient metal. Ornaments, coins, and statues have been fashioned from Copper since ancient times. Its distinct color and availability throughout history have afforded it great significance, though in modern times Copper is almost exclusively an industrial metal. Hide
Copper IN THE ROUGH PHOTOS
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Coral
Unlike most other gemstones which are of mineral origin, Coral is organic , formed by... More
Unlike most other gemstones which are of mineral origin, Coral is organic, formed by living organisms. It forms from branching, antler-like structures created from coral polyps in tropical and subtropical ocean waters. When the coral polyps die, the hardened skeleton remains, and this material is what is used as a gemstone. Most coral is white, but nature can create coral in several other colors, including the popular orange to red forms. This Red Coral, or Precious Coral as it is often known by, is the most used gemstone form of Coral. In fact, the color known as coral is derived from the typical pinkish-orange color of many red Coral gemstones. Hide
Coral IN THE ROUGH PHOTOS
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Danburite
Danburite is primarily a collectors gemstone. It is usually colorless yellow and ligh... More
Danburite is primarily a collectors gemstone. It is usually colorless; yellow and light pink gems are seldom cut. Danburite is named after the city of Danbury, Connecticut, where this mineral was first described, though no gem grade material has come from Danbury. Danburite has good hardness and facets well, but its lack of fire in colorless stones limits its use as a mainstream gemstone. Hide
Danburite GEMSTONE PHOTOS
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Diamond
Diamond, the most famed and fabled of all gemstones, is very unique in many ways. Ren... More
Diamond, the most famed and fabled of all gemstones, is very unique in many ways. Renowned for being the hardest substance on earth, its sparkling fire, durability, and rarity make Diamond the most prized of all gems. No gemstone contains as much allure and interest as does Diamond. Most Diamonds used as gemstones are colorless or very faintly colored. However, colored Diamonds, known as "fancies", can be extremely rare and valuable, and the most valuable gemstones ever known have been fancy Diamonds. In fact, fancy Diamonds are the most valuable substances known to man, with vivid colored Diamonds historically being sold for more than a million dollars per carat! Hide
Diamond IN THE ROUGH PHOTOS
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Diaspore
Diaspore as a mineral has been around since its discovery as a species in 1801, but i... More
Diaspore as a mineral has been around since its discovery as a species in 1801, but it wasn't until the 1970's that this mineral was first faceted for gemstone use. From the 1970's through 2005 occasional gems were cut from Diaspore for collectors, but in 2006 this mineral started being mined specifically for gemstone use. Though Diaspore is found in several localities throughout the world, the only source of gemstone material is in a Bauxite deposit in the Anatolian Mountains of central Turkey. Originally exploited for its economic importance for the extraction of aluminum, this deposit is now solely mined for the production of this gemstone. Hide
Diaspore IN THE ROUGH PHOTOS
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Diopside
Diopside has been regarded only as a collector s gemstone until recently, when the de... More
Diopside has been regarded only as a collector's gemstone until recently, when the deep forest-green Chrome Diopside variety has made its way into the mainstream gemstone market. Although its intense green color rivals that of Emerald, its low hardness makes it prone to scratches, thus limiting it from overwhelming the gemstone industry. Hide
Diopside IN THE ROUGH PHOTOS
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Dumortierite
div Dumortierite is a minor blue gemstone that usually forms as inclusion s in Quartz... More
Dumortierite is a minor blue gemstone that usually forms as inclusions in Quartz. Its most common color is blue or grayish-blue, though pink and purple colors are also known. Dumortierite's durability, combined with a high hardness, would make this an ideal gemstone, but the lack of transparency and often dull luster limit its use.
Dumortierite GEMSTONE PHOTOS
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Dumortierite IN THE ROUGH PHOTOS
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Emerald
Emerald, the green variety of Beryl , is the most famous and valuable green gemstone.... More
Emerald, the green variety of Beryl, is the most famous and valuable green gemstone. Its beautiful green color, combined with durability and rarity, make it one of the most expensive gemstones. Deep green is the most desired color in Emeralds. In general the paler
the color of an Emerald, the lesser its value. Very pale colored stones
are not called Emeralds but rather " Green Beryl". They are sometimes
heat treated, which causes their color to turn blue and transform into Aquamarine. Hide
Emerald IN THE ROUGH PHOTOS
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