Blog - Grand Auctions

Tanzanite is the blue to violet transparent variety of the mineral zoisite and is named after the locality in which it was first discovered – Tanzania. Zoisite can also be found in pinks, yellows, greens and browns with many of these other colours turning blue to violet when heated to 300°C – 400°C. In fact heat treatment is now so wide spread that Tanzanite is assumed to be heated and this has little impact on price.

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  • Posted by Simon Rufus

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