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Dyed and impregnated turquoise.
Impregnated and Dyed Turquoise

Wen Han, Taijin Lu, Huiru Dai, Jun Su, and Hui Dai, November 23, 2015

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

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The Identification of Zachery-Treated Turquoise | Gems & Gemmology

Emmanuel Fritsch, Shane F. McClure, March 1, 1999

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

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Abstracts; Winter 1991

Dona M. Dirlam

This article, from the Winter 1991 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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