Pleochroism in Faceted Gems • An Introduction • Lotus Gemology

The phenomenon of pleochroism in doubly refractive (DR) gemstones is described, as it relates to overall color appearance in the context of faceted gems. With strongly pleochroic gems, pleochroism can be seen in faceted gems, even if the table facet is oriented perpendicular to an optic axis. This is because facets change the direction of light as it moves through the gem.

The authors give an account of their epic 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.

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.

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

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

The history of Burma's jade mines, as seen through Western eyes, from the earliest accounts through World War II.

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.