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'Cobalt-Blue' Gem Spinels
'Cobalt-Blue' Gem Spinels

Similarities between natural spinels — with intense blue color — and synthetic material, have led to difficulties in the recognition of the natural stones by traditional methods.

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Abstracts; Summer 1991

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

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