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.

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.

Abstract Header from the 2009 issue of Gems & Gemology

Abstracts; Summer 2009

Brendan M. Laurs, Thomas W. Overton

This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

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.

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.

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.

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.

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.

Article Search Results

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Gemstones

Article Search Results

Types

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Gemstones

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