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A face-up view of a cushion cut diamond with blue color.

Article

Gems & Gemology’s 7 Most Unusual Encounters from 2019

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.

Article

Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

Russell Shor, August 14, 2015

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

Treated-Colour Pink-To-Red Diamonds from Lucent Diamonds Inc.

Wuyi Wang, Christopher P. Smith, March 1, 2005

Using a multi-step process, Lucent Diamonds has developed a new treatment process for certain natural diamonds that creates colours from pink-purple to red to orangey brown.

Contribution to the Identification of Treated Coloured Diamonds: Diamonds with Peculiar Colour-Zoned Pavilions

Emmanuel Fritsch and James E. Shigley, June 1, 1989

Some treated yellow and blue-to-green diamonds show a peculiar colour zoning when viewed through the pavilion.

“Fluorescence Cage”: Visual Identification of HPHT-Treated Type I Diamonds

Inga A. Dobrinets and Alexander M. Zaitsev

HPHT-treated type I diamonds of various colours may exhibit unusually intense fluorescence at the facet edges and junctions.

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