Summer 2013 - Volume 49, Issue 2
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Fluorescence Produced by Optical Defects in Diamond: Measurement, Characterization, and Challenges

How variations in UV lamp output can affect observed fluorescence color and intensity.

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Optical Defects in Diamond: A Quick Reference Chart

A simple chart on optical defects in diamond, including those that produce coloration and fluorescence colors.

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Jewels from Imperial St. Petersburg

By Ulla Tillander-Godenhielm, 295 pp., illus. publ. by Unicorn Press, London, 2012. US$80.00

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Ancient Tourmaline and Beryl from Afghanistan

Examination of a large private collection of beads and carvings from antique excavations, assembled in the 1970s by a collector in Afghanistan.

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Orangy Pink Coated "Soft Coral"

A coral specimen that was coated—not dyed—with a coloring agent only on the surface, an unusual method evidenced by microscopic features.

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Strands of Tiny Akoya Keshi Pearls

Tiny pearls only 0.7–0.9 mm in diameter presented in Tuscon by the Japanese Pearl Exporting Company.

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Green Kyanite

At the Riverpark Inn show in Tucson, gem dealer Tom Schneider (San Diego, California) exhibited a parcel of kyanite displaying an unusual saturated yellowish green color.

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Banded Mimetite

Yellow transparent mimetite—known to collectors as one of the rarest faceted stones—purchased in Tuscon and likely from Bolivia.

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Turquoise-Rock Crystal Composite

Examination of a faceted rock crystal backed by a slice of turquoise—an obvious but unusual combination of gem materials.

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Imitation Larimar

Examination of a 3.91 ct drop-shaped cabochon, purchased in India as a Larimar imitation.

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