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

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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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The internal structures of natural pearls from the marine mollusk Pinctada maxima are the subject of the lead article in this issue. The scattered loose pearls on the cover are from Paspaley’s natural pearl collection, which includes one discovered in the 1970s at the Eighty Mile Beach fishing grounds
G&G Spring 2021 Edition
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