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Figure 1. The two purple to reddish purple chrysoberyl samples from Brazil studied (left images) and two “normal” alexandrites from Hematia, Brazil (right images) in daylight (top) and incandescent light (bottom) illustrate the lower blue-green transmission with increased trivalent chromium. Photos courtesy of Karl Schmetzer.
“Red” Chrysoberyl versus Alexandrite: The Impact of Elevated Chromium Levels on Colour and Colour-Change Properties

Overview and commentary on the 2014 Journal of Gemmology article “Purple to Reddish Purple Chrysoberyl from Brazil”.

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Colombian Emeralds
Colombian Emerald Mining: Will the Giant Awaken?

Overview and commentary on the 2013 The Journal of Gemmology article “Peñas Blancas: An Historic Colombian Emerald Mine".

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HOC synthetic alexandrite inclusion.
Challenges in Orienting Alexandrite: The Usambara and Other Optical Effects in Synthetic HOC-Grown Russian Alexandrite

Overview and commentary on the 2013 Journal of Gemmology article “Synthetic alexandrites grown by the HOC method in Russia: Internal features related to the growth technique and colorimetric investigation”.

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This microphotograph shows layered growth zoning associated with intense colour zoning in a faceted synthetic alexandrite grown by Creative Crystals Inc.; immersion, field of view 5.3 × 4.0 mm. Photo courtesy of K. Schmetzer, The Journal of Gemmology.
Decades-Old Synthetic Alexandrite Sheds Light on Modern-Day Research Needs

An overview and commentary on the 2012 Journal of Gemmology article, “Flux-grown synthetic alexandrites from Creative Crystals Inc.”

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Abstracts; Summer 1991

From the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.

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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Autumn 2009

This article, from the Autumn 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.

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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Summer 2009

This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

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Abstracts; Spring 1991

This article, from the Spring 1991 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

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Abstracts; Winter 1991

This article, from the Winter 1991 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

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Abstracts; Autumn 1991

This article, from the Autumn 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.

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