Article Search Results

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.

10 Study Samples Before and After HPHT Processing

GE POL Diamonds: Before and After

Christopher P. Smith, George Bosshart, September 1, 2000

This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.

A History of Diamond Treatments

Thomas W. Overton and James E. Shigley, March 1, 2008

Modern gemmologists and diamantaires are faced with a broad spectrum of colour and clarity treatments ranging from the simple to the highly sophisticated.

A New Lasering Technique for Diamond

Shane McClure, John M. King, June 1, 2000

Several diamonds were treated for the purposes of observation and report with a new laser technique which does not show the typical surface-reaching drill hole.

The Characteristics and Identification of Filled Diamonds

John I. Koivula, Robert C. Kammerling, June 1, 1989

This article reports on the study of six diamonds, both before and after a filling treatment, and the examination of 12 additional filled stones.

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.

New Filling Material for Diamonds from Oved Diamond Company: A Preliminary Study

James E. Shigley, Shane F. McClure, June 1, 2000

The Oved Diamond Company’s new glass formulation is tested with mixed results.

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.

CVD Synthetic Diamonds from Gemesis Corp

Wuyi Wang, Ulrika F. S. D’Haenens-Johansson, Paul Johnson, Kyaw Soe Moe, Erica Emerson, Mark E. Newton, and Thomas M. Moses, June 1, 2012

An examination of the gemmological and spectroscopic properties of CVD synthetic diamonds from Gemesis Corp.

A Visual Guide to the Identification of Filled Diamonds

Shane F. McClure and Robert C. Kammerling, June 1, 1995

This article illustrates the various features in filled diamonds and explores the best techniques for examining them.

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Article Search Results

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