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The Elahera Gem Field in Central Sri Lanka

Mahinda Gunawardene and Mahinda S. Rupasinghe, June 1, 1986

The Elahera gem field currently provides approximately 35% of the gemstones exported from 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.

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.

Gem-Bearing Pegmatites: A Review

James E. Shigley and Anthony R. Kamp, June 1, 1984

A survey of the current gemmological knowledge of pegmatites, including the gem varieties aquamarine, tourmaline and topaz.

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.