Stuart Overlin, Brooke Goedert and Kellie Giordano, December 13, 2019
Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
Read MoreCarolyn H. van der Bogert, Christopher P. Smith, Thomas Hainschwang, and Shane F. McClure
The Argyle diamond mine is the only known source of type IaB hydrogen- and nitrogen-rich diamonds coloured grey to blue to violet.
Read MoreRussell Shor, June 12, 2015
G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.
Read MoreWuyi Wang, March 1, 2010
Pink CVD lab-grown products can be separated from natural and treated-colour natural pink diamonds by a combination of gemmological and spectroscopic properties, which are explored in this study.
Read MoreChristopher M. Breeding and James E. Shigley, June 1, 2009
Knowledge of type allows gemmologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.
Read MoreIlene M. Reinitz, Peter R. Buerki, June 1, 2000
Greenish yellow to yellowish green HPHT-treated diamonds exhibited highly saturated body colour, well-defined brown to yellow octahedral graining and visual evidence of heating, among other characteristics.
Read MoreBrendan M. Laurs, Thomas W. Overton
This article, from the Autumn 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.
Read MoreDavid J. F. Evans, David Fisher, March 1, 2005
The Diamond Trading Company (DTC) Research Centre had the opportunity to examine a diamond that, on submission to a commercial gem laboratory, turned out to be a coated pink diamond.
Read MoreTroy Ardon, October 17, 2013
Analysis of Fancy Light greenish yellow diamond leads to detection of nickel, as well as an inclusion that gives a colour-change effect.
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