Gem pegmatites of Minas Gerais, Brazil: the tourmalines of the Araçuaí districts
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
A survey of the current gemmological knowledge of pegmatites, including the gem varieties aquamarine, tourmaline and topaz.
The Elahera Gem Field in Central Sri Lanka
The Elahera gem field currently provides approximately 35% of the gemstones exported from Sri Lanka.
Sri Lanka: The Gem Island
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
A further article exploring tourmaline mines in another part of Minas Gerais.