Coated Tanzanite Hits the Market
In 2008, the first tanzanites exhibiting a coating to augment their color were discovered. These tanzanites on the right were part of a group of stones that were identified as having a thin coating layer to artificially improve their color. Sizes range from 0.29 to 4.22 ct.
The findings were published at the World of Gems Conference in the Autumn of 2008.
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