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Gem Mountain mining site
Update on the Rock Creek Sapphire Deposit

Warren Boyd and Keith Barron, July 31, 2015

An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.

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Phosphorescence in Synthetic Sapphire

Meenakshi Chauhan, October 17, 2013

Rare phosphorescence was observed in a synthetic sapphire, which had unusual properties not indicative of a particular growth method.

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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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