For the first time, GIA's laboratory has examined tanzanite colour-coated with titanium.
Some Tanzanite Imitations
Since at least 1995, various materials have been manufactured to imitate tanzanite in the gem trade.
Gem-Quality Green Zoisite
A new transparent, gem-quality green zoisite has been discovered in the Merelani Hills of mineral-rich Tanzania.
Abstracts; Summer 2009
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.