The Coscuez mine, one of a number in Colombia, is rapidly gaining significance as a major source of fine emeralds.

Chinese master carvers have produced some of the world's most sophisticated gemstone carvings.

China has identified many deposits with significant potential to produce gemstones; various species are discussed.

Several pearl-in-chicken cleaning experiments are carried out to test the validity of recipes from an ancient Egyptian source.

Eight garnet species are defined and methods of identification are described.

An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.

The author reports on a sudden influx of natural fancy pink diamonds and their origins.

An overview of Australia's recent significance in the production of blue sapphire.

A further article exploring tourmaline mines in another part of Minas Gerais.

A history of pearls in jewelry and fashions through the ages.

The unusual effects of dispersion and twinning produced by a calcite gemstone.

The unique mineralogical and gemological character of gem-quality red beryl from Utah.

Unusual color-change garnets.

An examination and analysis of 15 natural rubies with glass-filled cavities.

The American freshwater pearl industry and its new entry, the freshwater cultured pearl.

First in a series, this article reviews the exploration for gemstones and mining methods in Minas Gerais, Brazil.

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

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.

The author has uncovered many ancient references to the simulation or enhancement of gemstones.