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by Vincent Pardieu & Richard W. Hughes with Guillaume Soubiraa, Michael Rogers, Warne & Montgomery Chitty & Philippe Brunot
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by Richard W. Hughes, Thanong Leelawatanasuk, Wimon Manorotkul, Bonita Kwok, Lore Kiefert & Anne Carroll Marshall
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
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
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
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
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by Richard W. Hughes
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by John I. Koivula & Richard W. Hughes
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
Introducing the blue filter as a gemological tool to separate natural and Verneuil synthetic yellow sapphires.