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An Introduction to Photoluminescence Spectroscopy for Diamond and Its Applications in Gemology

Presents the underlying physics and methodology of this analytical technique, which has become an essential tool in identifying treated and synthetic diamonds.

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Fluorescence Produced by Optical Defects in Diamond: Measurement, Characterization, and Challenges

How variations in UV lamp output can affect observed fluorescence color and intensity.

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Evan Smith studies images of diamond inclusions on a computer.
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Postdoctoral Program Gives Scientists Access to Rare Research Opportunities

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

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

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

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

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

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Unusual Dumbbell-Like Inclusion in Diamond

Examination of a 0.40 ct near-colorless round brilliant diamond with a large inclusion resembling a dumbbell

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Pitfalls in Color Grading Diamonds by Machine

Two major sources of error make spectroscopically determined color grades unreliable.

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The GEM DiamondMaster and the Thermal Properties of Gems

Thermal properties and the potential applications of the GEM DiamondMaster in testing them.

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Revolution in Diamond Cutting: Laser Sawing of Diamond Crystals

This article describes the components and operation of the laser saw and its usefulness in diamond cutting.

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Modern Diamond Cutting and Polishing

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

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