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.
A Status Report on Gemstones from Afghanistan
An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.
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.