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Gem pegmatites of Minas Gerais, Brazil: the tourmalines of the Araçuaí districts

Keith Proctor, March 1, 1985

This second article in the series on Minas Gerais describes the major tourmaline deposits which produce some of the finest specimens ever seen.

A Status Report on Gemstones from Afghanistan

Gary W. Bowersox, December 1, 1985

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

Sri Lanka: The Gem Island

Peter C. Zwaan, June 1, 1982

An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.

Gem Pegmatites of Minas Gerais, Brazil: The Tourmalines of the Governador Valadares District

Keith Proctor, June 1, 1985

A further article exploring tourmaline mines in another part of Minas Gerais.