The mineral Diaspore was first found in 1801, however it wasn’t faceted for gemstone use until the 1970’s. Throughout the next 30 years only a few gemstones were cut for collectors. It wasn’t until 2006 that Diaspore started being mined specifically for gemstone use. Today the only commercial source for Diaspore is in the Anatolian Mountains of central Turkey. Diaspore can be found in red, yellow, green and pink. Diaspore is known for its amazing color changing habits when subjected to different lighting conditions.
* Diopside >
Diopside comes in four different varieties, the bright green Chrome Diopside being the most popular in the gemstone community. Chrome diopside has low hardness, and is prone to scratches, however it’s beautiful green color rivals that of Emerald. Other varieties of Diopside include Star Diopside, Tashmarine Diopside, and Violane.
* Dioptase >
Dioptase is a brightly colored mineral, highly desired for its intense green color. It can form in very distinctive, well-developed crystals, but only a handful of well-known deposits have produced large crystals. Most localities of this mineral, including those in Arizona, only produce microcrystals. Dioptase crystals are generally fragile and can easily break or crumble, and therefore care must be exercised when handling specimens.
* Dolomite >
Dolomite is a very common mineral and is best known for its saddle-shaped curved crystal aggregates. A unique, isolated Dolomite occurrence in Eugui, Spain has provided colorless transparent crystals that resemble the Iceland Spar variety of Calcite, and have no resemblance to Dolomite specimens from any other localities. The occurence of Kolwezi, in the Congo (Zaire) has produced some fascinating, cobalt-rich specimens that are a beautiful hot pink color and are extremely popular.
* Emerald >
Emerald is the green variety of Beryl. It’s combination of durability, and rarity, matched with its stunning green color make this gemstone the most expensive of all other green stones. The darker, deeper, green specimens are the most coveted. Varieties of Emerald include Brazilian Emerald, Cat’s Eye Emerald, Colombian Emerald, Star Emerald, Trapiche Emerald, and Zambian Emerald. Significant Emerald deposits can be found in Colombia, and Zambia.
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