Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
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Natural gemstones are typically far more valuable than synthetic ones, so being able to identify them correctly is a powerful skill.
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Analysis reveals blue lead glass filling in a sapphire that has an overall green bodycolour as a result of the filling’s combination with natural yellow colour.
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This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.
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.
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Advances in technology and increased demand for lower-priced gem materials contributed to the proliferation of new treatments throughout the first decade of the 2000s.
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During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges.
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