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.

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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 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
Inside Out  |  Inclusions and the Symmetry of Crystals

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
Living in the Dark Ages  |  The Fiber-Optic Light

The role of fiber-optic lighting in gemological microscopy.

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by Richard W. Hughes
Ownership of Words  |  An Essay on Padparadscha Sapphire

The definition of padparadscha sapphire, from early to modern times.

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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
Proletarian Gemology  |  The Blue Filter

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

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