A tourmaline displaying different colours of chatoyancy on opposite sides of a double cabochon is examined.
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The blue cap termination from a tourmaline crystal was preserved and polished, yielding a unique designer gem.
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Circumnavigate the boreal reaches of the globe to explore gems from polar regions.
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Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink colour were examined for this report.
Read MoreInclusions of native copper and tenorite (CuO) were found in greyish-green elbaite from São José da Batalha, Paraíba, Brazil.
Read MoreFrom the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.
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This article, from the Winter 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read MoreThis article, from the Spring 1991 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read MoreAn overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.
Read MoreA report on Zambian emeralds with tourmaline inclusions.
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