Circumnavigate the boreal reaches of the globe to explore gems from polar regions.
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A cabochon displaying asterism is found to be an untreated spinel with two different stars.
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A spinel from Madagascar, mixed in with a parcel of blue sapphire, exhibited an array of internal features.
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A singly refractive inclusion within a yellow sapphire proves to be spinel.
Read MoreFrom the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.
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Examination of a pink-purple spinel revealed what appeared to be a spinel crystal inclusion.
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Similarities between natural spinels - with intense blue colour - and synthetic material, have led to difficulties in the recognition of the natural stones by traditional methods.
Read MoreThis article, from the Winter 1991 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read MoreThis article, from the Autumn 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.
Read MoreThis article reports on three gem materials currently being mined in Pakistan.
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