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Optical defects in diamond: a quick reference chart

James E. Shigley, July 24, 2013

A simple chart of optical defects in diamond, including those that produce colouration and fluorescence colours.

Fluorescence produced by optical defects in diamond: measurement, characterisation and challenges

Yun Luo, July 24, 2013

How variations in UV lamp output can affect observed fluorescence colour and intensity.

Grey-To-Blue-To-Violet Hydrogen-Rich Diamonds from the Argyle Mine, Australia

Carolyn 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.

Coloured Diamonds in the Aurora Butterfly of Peace Collection

The “Type” Classification System of Diamonds and Its Importance in Gemmology

Christopher 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.

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.

Detection of Treatment in Two Unusual Green Diamonds

Emmanuel Fritsch, James E. Shigley, September 1, 1988

A pair of sharp absorption bands in the near-infrared region, referred to as H1b and H1c, have been detected in one (and the H1b band in the other) of two green diamonds known to have been treated.

“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.

Lab-Grown Coloured Diamonds from Chatham Created Gems

James E. Shigley, Shane F. McClure, June 1, 2004

This article compares some of Chatham Created Gems’ synthetic coloured diamonds to natural diamonds and explains the results.

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