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Faceted Cobalt-Diffused Spinel and Polished Plate Samples

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GIA Lab Reports on a New Cobalt Diffusion Treatment of Natural Spinel

Sudarat Saeseaw, Vararut Weeramonkhonlert, Charuwan Khowpong, Nattida Ng-Poorsatien and Supharat Sangsawong, Victoria Raynaud, and Claire Ito, June 11, 2015

Report on a new cobalt diffusion treatment of natural spinel, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.

Abstracts; Summer 1991

Dona M. Dirlam

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

'Cobalt-Blue' Gem Spinels

James E. Shigley and Carol M. Stockton, March 1, 1984

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.

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