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

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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Artificially Induced Color in Amethyst-Citrine Quartz

A new and rather unusual gem material and possible treatments are discussed.

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Abstracts; Fall 1991

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

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Abstracts; Summer 1991

From the Summer 1991 issue of Gems & Gemology, a summary of important gemology-related articles published in other journals.

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