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Gerd Dreher agate lily and Patrick Dreher citrine mouse

Gem Virtuosos: The Drehers and Their Extraordinary Carvings

Robert Weldon, Cathleen Jonathan, and Rose Tozer, January 26, 2018

A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.

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.

Amethyst from Four Peaks, Arizona

Jack Lowell and John I. Koivula, September 1, 2004

For more than a century, the Four Peaks mine in Maricopa County, Arizona, has produced gem-quality amethyst.

Amethyst Mining in Brazil

David Stanley Epstein, December 1, 1988

Brazil is currently the leader in overall production of amethyst.

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