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Azurite Gemstone Information. Azurite is a rare variety of gemstone-quality copper ore. Azurite is one of two basic copper carbonate minerals (malachite is the other). Azurite is rarer than malachite and is considered more valuable. Azurite gets its name from the Persian word 'lazhward', which refers to its distinctive, vivid blue color.
Yttrium aluminium garnet (YAG), Y 3 Al 2 (AlO 4) 3, is used for synthetic gemstones. Due to its fairly high refractive index, YAG was used as a diamond simulant in the 1970s until the methods of producing the more advanced simulant cubic zirconia in commercial quantities were developed.ndradite is a calcium-iron garnet, Ca 3 Fe 2 (SiO 4) 3, is of variable composition and may be red, yellow, brown, green or black. The recognized varieties are topazolite (yellow or green), demantoid (green) and melanite (black).