Unique rough and faceted luminescent synthetic garnet-like crystals were on display at the 22nd Street show in Tucson.
Read MoreA relatively new production of red corundum, reportedly from Bangkok, has been offered for sale in recent years.
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An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.
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The Antwerp lab examines CVD laboratory-grown diamonds where HPHT processing resulted in relatively low color grades.
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Explores statistical data and defining characteristics of gem-quality CVD synthetic diamonds examined by GIA since 2003.
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Examines a new source of colorless and near-colorless gem-quality HPHT synthetic diamonds using spectroscopic and gemological analysis.
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Abstracts of speaker presentations from the “New Technologies and Techniques” session of GIA’s 2018 International Gemological Symposium.
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Examination of the largest HPHT synthetic diamonds GIA has examined so far demonstrated significant progress in this growth technology.
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Examines a form of asterism comprising two six-rayed stars, one white and one that exhibits the stone’s bodycolor. Firsthand accounts and a survey of patent documents reveal that diffusion has been used to create or enhance this optical phenomenon in synthetic and possibly natural corundum since the 1950s.
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Two near-colorless rounds, weighing 3.23 and 2.51 ct, were the largest CVD-grown synthetic diamonds GIA has examined.
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