Feature Gems & Gemology, Summer 2010, Volume 46, No. 2

X-ray Computed Microtomography Applied to Pearls: Methodology, Advantages, and Limitations

Stefanos Karampelas, Jürgen Michel, Mingling Zheng-Cui, Jens-Oliver Schwarz, Frieder Enzmann, Emmanuel Fritsch, Leon Leu, and Michael S. Krzemnicki

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X-ray computed microtomography reveals the internal features of pearls with great detail. This method is useful for identifying some of the natural or cultured pearls that are difficult to separate using traditional X-radiography. The long measurement time, the cost of the instrumentation, and the fact only one pearl at a time can be imaged are some of this method’s disadvantages.