Treated Fancy Red Diamond

Paul Johnson and Christopher M. Breeding

June 15, 2009

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Examines a 2.14 ct oval-cut diamond, graded as Fancy red, whose red color was produced through a combination of high-presssure, high-temperature (HPHT) treatment and irradiation plus annealing.

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Explores the usefulness of this technique in the mapping of defects and spectral features, the determination of color origin, and the identification of synthetic and treated diamond melee.

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Details the sapphire mining and trading situation at this newly discovered deposit, including descriptions of the area's geology and samples observed during the expedition.

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Treated Fancy Red Diamond

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