Winter 2013 - Volume 49, Issue 4
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Large Synthetic Moissanite with Silicon Carbide Polytypes

Examination of the properties of a synthetic moissanite specimen submitted as a black diamond.

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Spinel Submitted as Diamond

It is a rare occurrence when a diamond simulant submitted to a GIA laboratory turns out to be a natural gemstone.

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Stellate Zircon Inclusions in Vivid Purple-Pink Morganite

Zircon clusters and other inclusions help to create an unusual vivid purple-pink morganite specimen.

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Silicon in Natural Type IIa and Type IaB Diamond

Silicon, normally associated with CVD synthetic diamond, may be found in natural diamond.

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Black Diamond with Unusual Color Origin

This black diamond's color was produced by natural radiation stains, an unusual cause of color.

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