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These five tanzanite samples (0.39–0.82 ct) proved to be colour-coated with titanium. Photo by Don Mengason.

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Titanium-Coated Tanzanite

Amy Cooper and Nathan Renfro, February 7, 2014

For the first time, GIA's laboratory has examined tanzanite colour-coated with titanium.

Some Tanzanite Imitations

Lore Kiefert and Susanne Th. Schmidt, December 1, 1996

Since at least 1995, various materials have been manufactured to imitate tanzanite in the gem trade.

Gem-Quality Green Zoisite

N. R. Barot and Edward W. Boehm, March 1, 1992

A new transparent, gem-quality green zoisite has been discovered in the Merelani Hills of mineral-rich Tanzania.

Abstract Header from the 2009 issue of Gems & Gemology

Abstracts; Summer 2009

Brendan M. Laurs, Thomas W. Overton

This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

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