Article Search Results

A large group of people outside on GIA’s Carlsbad, California campus.

Article

Guardians of Trust: GIA’s Innovative Research, Instruments and Services

Russell Shor, September 20, 2019

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.

A woman sits in front of a computer screen with the DiamondView to her right.

Article

Inside De Beers’ Lightbox Diamonds

Russell Shor, March 18, 2019

GIA researcher analyses and confirms that De Beers’ Lightbox diamonds are grown using the chemical vapour deposition process.

Evan Smith studies images of diamond inclusions on a computer.

Article

Postdoctoral Programme Gives Scientists Access to Rare Research Opportunities

Amanda J. Luke, November 16, 2016

GIA’s postdoctoral programme gives researchers access to gemmological data, equipment, and rare, unusual and large gems in its laboratories.

Article

Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

Russell Shor, August 14, 2015

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

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)

Book Review: Handbook of Spectral Lines in Diamond, Volume 1: Tables and Interpretations

Bernhard Dischler, 467 pp., publ. by Springer-Verlag Berlin and Heidelberg GmbH & Co., Berlin; New York, 2012, US $120, October 19, 2013

By Bernhard Dischler, 467 pp., publ. by Springer-Verlag Berlin and Heidelberg GmbH & Co., Berlin; New York, 2012, US $120

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.

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