A Status Report on Gemstones from Afghanistan
An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.
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.
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.
Sri Lanka: The Gem Island
An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.