by Richard W. Hughes & Vincent Pardieu
Downtown: Gem hunting in Central & Southern Tanzania  |  Lotus Gemology

Since the late 1960's, East Africa has been home to some of planet earth's greatest gem discoveries. And yet, little has been written about certain of these finds. In the autumn of 2007, the authors set out to fill in the gaps, specifically regarding Tanzania's Mahenge, Songea and Tunduru regions.

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by Vincent Pardieu & Richard W. Hughes with Guillaume Soubiraa, Michael Rogers, Warne & Montgomery Chitty & Philippe Brunot
Working the Blueseam  |  The Tanzanite Mines of Merelani

An over-and-underground look at the tanzanite mines of Merelani, Tanzania, where the First World meets the Third, and graphite-covered miners pull glittering blue gems from black earth.

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by John L. Emmett & Richard W. Hughes
Betwixt Two Worlds: A Search for Gemology in the 21st Century

Traditional gemology considers itself a science, but typically omits a key element of the scientific method. And is gemology simply a science, or something more? Read on to learn the answer…

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by Richard W. Hughes, Thanong Leelawatanasuk, Wimon Manorotkul, Bonita Kwok, Lore Kiefert & Anne Carroll Marshall
The Chinese Box  |  A Guangzhou Jade Market Puzzle  |  Lotus Gemology

An investigation into nephrite and imitation nephrite pebbles purchased in Guangzhou, China's Hualin Street jade market.

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by Richard W. Hughes
Gem Inclusions & the Symmetry of Crystals • Inside Out • Lotus Gemology

A discussion of how inclusion patterns mimic crystallographic symmetry in ruby and sapphire.

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by Thanong Leelawatanasuk, Wilawan Atichat, Visut Pisutha-Arnond, Pornsawat Wattanakul, Papawarin Ounorn, Wimon Manorotkul & Richard W. Hughes
Cobalt-Doped Glass-Filled Sapphires  |  An Update  |  Lotus Gemology

The history of glass-infilling in blue sapphire, along with a description of the latest treatment generation developed in Chanthaburi, Thailand.

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by John I. Koivula & Richard W. Hughes
Following the Silk Road  |  Rutile in Corundum

A discussion of rutile silk in corundum and its use in detecting artificial heat treatment. Careful examination of these "silk" inclusions can provide vital clues to unmask heated gems.

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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
Identifying Yellow Sapphire • Blue Filter • Proletarian Gemology

Introducing the blue filter as a gemological tool to separate natural and Verneuil synthetic yellow sapphires.

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by Richard W. Hughes
Burma's Jade Mines • A History

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

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