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The Characteristics and Identification of Filled Diamonds

This article reports on the study of six diamonds, both before and after a filling treatment, and the examination of 12 additional filled stones.

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A New Lasering Technique for Diamond
A New Lasering Technique for Diamond

Several diamonds were treated for the purposes of observation and report with a new laser technique which does not show the typical surface-reaching drill hole.

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Coloured Diamonds in the Aurora Butterfly of Peace Collection
The “Type” Classification System of Diamonds and Its Importance in Gemmology

Knowledge of type allows gemmologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.

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A face-up view of a cushion cut diamond with blue color.
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Gems & Gemology’s 7 Most Unusual Encounters from 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

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