Article Search Results

Book Review: From a Snowflake to an Iceberg: The McFerrin Collection

Dorothy McFerrin, publ. by the McFerrin Foundation, College Station, Texas, 2013, US $125, October 19, 2013

By Dorothy McFerrin, publ. by the McFerrin Foundation, College Station, Texas, 2013, US $125 (£74)

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.

GIA’s Symmetry Grading Boundaries for Round Brilliant Cut Diamonds

Ron H.Geurts, Ilene M. Reinitz, Troy Blodgett, and Al M. Gilbertson, December 1, 2011

A presentation of parameters used to support GIA's symmetry grading system.

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.

Colour Grading “D-to-Z” Diamonds at the GIA Laboratory

John M. King, December 1, 2008

This article discusses the history and ongoing development of GIA's colour grading system, and explains how its laboratory applies it.

Star of the South: A Historic 128 Ct Diamond

Christopher P. Smith and George Bosshart, March 1, 2002

This article presents the first complete gemmological characterisation of the historic 128.48 ct Brazilian diamond known as the Star of the South.

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.

Fingerprinting of Two Diamonds Cut from the Same Rough

Ichiro Sunagawa, Toshikazu Yasuda, December 1, 1998

With the information from a combination of tools now available, the sophisticated gemmologist can fingerprint a given stone.

Modern Diamond Cutting and Polishing

Akiva Caspi, June 1, 1997

Over the last 25 years, the diamond-cutting industry worldwide has been revolutionised by sophisticated instruments that provide invaluable aid in the process of creating a polished gem.

A Chart for the Separation of Natural and Synthetic Diamonds

James E. Shigley, Emmanuel Fritsch, December 1, 1995

Exploration of a chart designed to give jewellers and gemmologists a practical guide to identifying synthetic diamonds as they enter the jewellery trade.

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