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The 3543 CM-1 Infrared Absorption Band in Natural and Synthetic Amethyst and its Value in Identification

Vladimir S. Balitsky, Denis V. Balitsky, June 1, 2004

The proper use and limitations of IR spectroscopy for identifying natural versus synthetic amethyst of various types have been investigated, focusing on the region 3800–3000 cm-1.

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A Simple Procedure to Separate Natural from Synthetic Amethyst on the Basis of Twinning

Robert Crowningshield, Cornelius Hurlbut, September 1, 1986

Where there are no inclusions or colour zoning, the presence of Brazil twinning in the natural amethyst will usually make the distinction.

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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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