Article Search Results

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.

Cutting Diffraction Gratings to Improve Dispersion (“Fire”) in Diamonds

Al Gilbertson, Benjamin Gudlewski, Mary Johnson, George Maltezos, Axel Scherer, and James Shigley

A new microlithography process developed to create high-resolution diffraction grating patterns on portions of certain facets can improve the dispersion of light and thus the amount of “fire” in a diamond.

A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds

Thomas M. Moses, Mary L. Johnson, September 1, 2004

The GIA diamond cut grading system described here includes the components of brightness, fire, scintillation, polish and symmetry, as well as weight and durability concerns, into a single overall grade for cut quality for standard round brilliants.

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.

Marine mining of diamonds off the west coast of Southern Africa

John J. Gurney, Alfred A. Levinson, December 1, 1991

It is anticipated that production of diamonds from the sea will increase substantially in the future.

Synthetic Gem Materials and Simulants in the 1990s

John I. Koivula, Maha Tannous, December 1, 2000

The 1990s witnessed important developments in the commercial viability of gem-quality synthetic diamonds.

The Rise to Prominence of the Modern Diamond Cutting Industry in India

Menahem Sevdermish, Alan R. Miciak, March 1, 1998

this article reviews the rise of the modern diamond cutting industry in India and its impact on the world diamond trade

Synthetic Moissanite: A New Diamond Substitute

Kurt Nassau, Shane F. McClure, December 1, 1997

Synthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterise it.

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 Gemmological Properties of the De Beers Gem-Quality Synthetic Diamonds

James E. Shigley, Emmanuel Fritsch, December 1, 1987

Examination of a group of 14 brownish yellow, yellow and greenish yellow synthetic diamonds reveals distinctive gemmological properties.

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