The early history of beryllium diffusion in sapphire, starting with the 2001 appearance of large numbers of padparadscha sapphires in the Thai gem market.

Jadeite jade is a stone intimately associated with Burma (Myanmar). But there are deposits in other countries. This article details Russia's jadeite deposits in the Polar Urals and Khakassia.

An account of the authors' 1997 visit to Burma's jade mines.

In 1996, several gemologists set off for Burma's remote jade mines, the first visit by foreigners since the early 1960's. This is the story of their epic journey.

A brief history of Burmese (Myanmar) sapphires, along with details of some of the major pieces of yore.

The author makes his first pilgrimage to Burma's Mogok Stone Tract.

Many gemologists have difficulty mastering the direct-vision spectroscope. This article eases the pain.

The Thai city of Chanthaburi (จันทบุรี) may be small, but it has played an important role in both the history of Thailand and the gem trade. Taking its name from the Sanskrit word for moon ('chan'), this petite town is among the most charming in the Land of Smiles.

The history of the Black Prince's Ruby, one of the world's most famous precious stones.

A discussion of brilliance, windows and extinction as they relate to the face-up appearance of colored gemstones. Diagrams demonstrate that extinction is largely a function of cut.