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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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Infrared Spectroscopy of Natural vs. Synthetic Amethyst: An Update

When microscopic identification is not feasible, FTIR spectra at high resolution (0.5 cm–1) can distinguish natural and synthetic amethyst.

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Identification of Extraterrestrial Peridot by Trace Elements
Identification of Extraterrestrial Peridot by Trace Elements

Twenty-six peridot samples from the Esquel pallasite meteorite and 27 samples from 10 terrestrial sources were studied by laser ablation.

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A Status Report on Gemstones from Afghanistan

An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.

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

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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