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Dyed and impregnated turquoise.
Impregnated and Dyed Turquoise

Natural turquoise has been subjected to dyeing and three types of impregnation.

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The Identification of Zachery-Treated Turquoise | Gems & Gemology

Millions of carats of turquoise have been enhanced by a proprietary process called the Zachery treatment.

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Abstracts; Winter 1991

This article, from the Winter 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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