Article Search Results

Faceted Cobalt-Diffused Spinel and Polished Plate Samples

Article

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.

Article

Spring 2015 G&G Examines Blue Spinel, Chinese Jewellery Design and the Latest in Synthetics

Russell Shor, June 12, 2015

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

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.

Spinel Inclusion in Spinel

Amy Cooper and Ziyin Sun, January 30, 2015

Examination of a pink-purple spinel revealed what appeared to be a spinel crystal inclusion.

'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.

The Elahera Gem Field in Central Sri Lanka

Mahinda Gunawardene and Mahinda S. Rupasinghe, June 1, 1986

The Elahera gem field currently provides approximately 35% of the gemstones exported from Sri Lanka.

Abstracts; Autumn 1991

Dona M. Dirlam

This article, from the Autumn 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.

A Status Report on Gemstones from Afghanistan

Gary W. Bowersox, December 1, 1985

An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.

This rough spinel, submitted as a diamond, displayed trigons orientated in the direction opposite to that of the crystal face.

Spinel submitted as diamond

Martha Altobelli, Paul Johnson, and Kyaw Soe Moe, January 31, 2014

It is a rare occurrence when a diamond simulant submitted to a GIA laboratory turns out to be a natural gemstone.

Article

Spinel submitted as diamond

Martha Altobelli, Paul Johnson and Kyaw Soe Moe, January 31, 2014

It is a rare occurrence when a diamond simulant submitted to a GIA laboratory turns out to be a natural gemstone.

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