Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
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Circumnavigate the boreal reaches of the globe to explore gems from polar regions.
Read MoreProvides a visual guide to the internal features of natural, synthetic and treated rubies.
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Inclusions in technogenic ruby slag help to separate this material from other specimens, both natural and synthetic.
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G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.
Read MoreSome manufacturers are known to have treated Verneuil flame-fusion synthetic rubies by immersion in a flux melt to induce patterns like the “fingerprints” seen in some natural rubies.
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Gem-quality rubies and pink to purple sapphires are being recovered from the Luc Yen and Quy Chau mining regions of Vietnam.
Read MoreAn overview of the potential effects that heat treatment can have on corundum.
Read MoreA review of heat treatment methods available for use on natural or synthetic corundum.
Read MoreThis article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.
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