Geologist and publisher earns his GG so he can share more information on gem materials with visitors to Geology.com, his Earth Science website.
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Discusses the mineralogical composition and provenance of this spotted decorative gemstone.
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Review of Minerals of Georgia: Their Properties and Occurrences, 2nd ed. by Robert B. Cook and Julian C. Gray.
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A summary of the content found in the Autumn 2016 issue of Gems & Gemology.
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GIA’s postdoctoral programme gives researchers access to gemmological data, equipment, and rare, unusual and large gems in its laboratories.
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Gem-quality peridot is occasionally found as mantle xenoliths within basalts near Pozzomaggiore.
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Review of The Collector's Guide to the Minerals of New York State
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Review of The Collector's Guide to the Minerals of New York State
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The Argyle diamond mine is the only known source of type IaB hydrogen- and nitrogen-rich diamonds coloured grey to blue to violet.
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Review of Minerals of Georgia: Their Properties and Occurrences, 2nd ed. by Robert B. Cook and Julian C. Gray.
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