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Chameleon diamond before and after heating

Chameleon Diamond with Nickel Absorption Band

Troy Ardon, July 25, 2014

A rare chameleon diamond is examined in GIA's Carlsbad lab.

A Gemmological Study of a Collection of Chameleon Diamonds

Thomas Hainschwang, Dusan Simic, March 1, 2005

Chameleon diamonds are among the rarest of gem diamonds.

Cape Diamond with Yellow Phosphorescence

Kyaw Soe Moe, Jon Neal, and Paul Johnson, May 8, 2017

A cape diamond examined in the New York lab shows rare yellow phosphorescence.

The Foxfire Diamond, Revisited

James E. Butler, Jeffrey E. Post, and Wuyi Wang, January 26, 2018

The 187.63 ct rough diamond from Canada’s Diavik mine shows surprising reactions to ultraviolet light.

Recently discovered and legendary diamonds in the blue/gray/violet color range

Natural-Colour Blue, Grey and Violet Diamonds: Allure of the Deep

Sally Eaton-Magaña, Christopher M. Breeding, and James E. Shigley, August 6, 2018

Summarises data collected on more than 15,000 natural blue/grey/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this colour range.

Fancy Dark brown to Fancy black Marange diamonds

Black Diamonds from Marange (Zimbabwe): A Result of Natural Irradiation and Graphite Inclusions

Karen V. Smit, Elina Myagkaya, Stephanie Persaud, and Wuyi Wang, August 6, 2018

Characterises a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.

Article

Diamond Description

Diamond is the only gem made of a single element: It is typically about 99.95 per cent carbon. The other 0.05 per cent can include one or more trace elements, which are atoms that aren’t part of the diamond’s essential chemistry. Some trace elements can influence its colour or crystal shape.

Article

Diamond Journey

Diamonds are among nature’s most precious and beautiful creations

Diamonds in Canada

B. A. Kjarsgaard and A.A. Levinson, September 1, 2002

This article chronicles the discovery of primary diamond deposits throughout Canada, whose increasing supply of rough stones will have a growing impact on the world diamond industry.