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Tanzanite is the blue-violet variety of zoisite, a mineral in the epidote group. To become tanzanite, zoisite, which is colored a reddish brown to clear, must be heated to remove the brownish "veil" and bring out tanzanite's blue-violet color. It is rare to find naturally heated tanzanite, and most tanzanite has been artificially heated.
The tanzanite in this sterling silver ring measures 18x17mm (including the setting), and fits size 10.