Fall 2013 - Volume 49, Issue 3
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Amber with Insect-Bearing Filling

Natural amber beads were found to have been filled with plastic and a variety of insects.

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Boron Carbide: A New Imitation of Black Diamond

The Gem Testing Laboratory in Jaipur identified a black diamond-like specimen as boron carbide, a ceramic material typically used in nuclear, military, and aerospace applications.

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Unusual Epigenetic Malachite Discs in Quartz

The uncommon occurrence of epigenetic malachite, as found in this quartz, can result in vivid green color.

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Water Immersion Reveals Dye in Fire Opal

A simple test easily detected dye treatment in fire opal.

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Corundum Carving Coated with Colored Polymer

An opaque carving was identified as color-coated corundum based on visual features, as RI and SG could not be measured because of the piece’s large size.

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Unusual Faceted Massive Fuchsite

An unusually large faceted fuchsite, the chromian variety of muscovite, was identified and its green color explained.

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Phosphorescence in Synthetic Sapphire

Rare phosphorescence was observed in a synthetic sapphire, which had unusual properties not indicative of a particular growth method.

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