by Richard W. Hughes
Brilliance, Windows, and Extinction in Gemstones

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.

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by Richard W. Hughes & John I. Koivula
Dangerous Curves • A Reexamination of Verneuil Synthetic Corundum

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.

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by Richard W. Hughes
Jade Buying Guide • LotusGemology.com

This article discusses the factors that influence quality and what to look for when buying both jadeite and nephrite. A list of jade auction records is also included.

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by Richard W. Hughes, Olivier Galibert, George Bosshart, Fred Ward, Thet Oo, Mark Smith, Tay Thye Sun & George Harlow
Burmese Jade  |  The Inscrutable Gem

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.

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by Richard W. Hughes
Buying at the Source

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.

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by Richard W. Hughes & Vincent Pardieu, with Guillaume Soubiraa & Dana Schorr
Moon Over the Pamirs  |  Chasing Ruby and Spinel in Tajikistan

A 2006 mission to remote ruby and spinel localities in Tajikistan.

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by Richard W. Hughes, with Vincent Pardieu & Dana Schorr
Sorcerers & Sapphires  |  A Visit to Madagascar

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

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by Richard W. Hughes
Under the Hammer  |  Ruby & Sapphire Auction Records

World auction records for ruby, sapphire and spinel.

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by Wilawan Atichat & Richard W. Hughes
Rock talk  |  A Mogok Geology Primer

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

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