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Gemstones

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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 Identification of Turquoise by Infrared Spectroscopy and X-Ray Powder Diffraction

Th. Lind, K. Schmetzer, September 1, 1983

Two techniques for identifying natural, treated and synthetic turquoise are examined.

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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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