A Survey of the Gemstone Resources of China
Gemstone Carving in China: Winds of Change
Chinese master carvers have produced some of the world's most sophisticated gemstone carvings.
Amethystine Chalcedony
The Pearl in the Chicken: Pearl Recipes in Papyrus Holmiensis
A Proposed New Classification for Gem-Quality Garnets
Eight garnet species are defined and methods of identification are described.
A Status Report on Gemstones from Afghanistan
An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.
Pink Diamonds from Australia
The author reports on a sudden influx of natural fancy pink diamonds and their origins.
Sapphires from Australia
An overview of Australia's recent significance in the production of blue sapphire.
Gem Pegmatites of Minas Gerais, Brazil: The Tourmalines of the Governador Valadares District
An Extraordinary Calcite Gemstone
The unusual effects of dispersion and twinning produced by a calcite gemstone.
Natural Rubies with Glass-Filled Cavities
Gem-Quality Red Beryl from the Wah Wah Mountains, Utah
The unique mineralogical and gemological character of gem-quality red beryl from Utah.
Freshwater Pearls of North America
The American freshwater pearl industry and its new entry, the freshwater cultured pearl.
Gem Pegmatites of Minas Gerais, Brazil: The Tourmalines of the Araçuaí Districts
First in a series, this article reviews the exploration for gemstones and mining methods in Minas Gerais, Brazil.
Gem-Bearing Pegmatites: A Review
A survey of the current gemological knowledge of pegmatites, including the gem varieties aquamarine, tourmaline, and topaz.
The Early History of Gemstone Treatments
'Cobalt-Blue' Gem Spinels
Similarities between natural spinels — with intense blue color — and synthetic material, have led to difficulties in the recognition of the natural stones by traditional methods.
Cobalt Glass as a Lapis Lazuli Imitation
The properties of a novel gemological imitation, cobalt glass.
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