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.

Virtually all gemologists are aware of the curved growth lines and gas bubbles in Verneuil (flame-fusion) synthetic corundum, but few understand exactly why they occur and how they are distributed in these stones. This article clarifies these important identifying features.

An exploration of the history and lore of the Emerald Buddha, a green statue that resides in Bangkok, Thailand’s Wat Phra Kaeo and watches over Thailand.

Myanmar's jadeite mines occupy a privileged place, representing the planet's principal source of fine jadeite jade. This article covers the deposits themselves, along with the cutting, grading and trading of jadeite.

An essay on buying gems at the source in Asia, with a discussion of how con men play on the greed of those who believe gems will be cheaper at the mines.

In search of ruby and sapphire on the lost Isle of Madagascar.

A look at the geology of Myanmar's Mogok Stone Tract, home to pigeon's blood rubies and so much more…

An account of a 2013 visit to Mogok – Myanmar's fairy-tale wonderland.

In search of Thailand's last ruby miner.

One of the greatest gemological challenges is determining if a ruby or sapphire has been heat treated. UV fluorescence can assist in that identification, as well as detecting fillers in emerald.