GIA Lab Reports on a New Cobalt Diffusion Treatment of Natural Spinel
Report on a new cobalt diffusion treatment of natural spinel, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.
Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry Design and the Latest in Synthetics
G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.
Blue Spinel from the Luc Yen District of Vietnam
Offers geological context and gemological characterization of this increasingly popular vivid blue spinel from northeast Vietnam.
'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.
Gemstones of Pakistan: Emerald, Ruby, and Spinel
This article reports on three gem materials currently being mined in Pakistan.