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Gemstones

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Copper and tenorite inclusions in cuprian-elbaite tourmaline from Paraíba, Brazil

Franz Brandstätter and Gerhard Niedermayr, September 1, 1994

Inclusions of native copper and tenorite (CuO) were found in greyish-green elbaite from São José da Batalha, Paraíba, Brazil.

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Gemstone Durability: Design to Display

Deborah Dupont Martin, June 1, 1987

A treatise on the design, display, care and repair of fine gemstones.

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Spectral Differentiation Between Copper and Iron Colourants in Gem Tourmalines
Spectral Differentiation Between Copper and Iron Colourants in Gem Tourmalines

Paul B. Merkel and Christopher M. Breeding

The authors used Vis-NIR spectral measurements combined with LA-ICP-MS data to investigate the usefulness of absorption spectra.

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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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