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Green Amber
Characterization of “Green Amber” With Infrared and Nuclear Magnetic Resonance Spectroscopy

A peridot-like bright greenish yellow to green gem material called “green amber” has recently appeared in the gem market.

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Digital Photomicrography for Gemologists

A guide to capturing gem inclusion scenes using practical equipment and techniques and the appropriate image-refining software.

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Fluorescence image of Aurora Butterfly of Peace
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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Article
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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Foldscope
The Foldscope and Its Gemological Applications

The author tests the suitability of a portable paper microscope, called the Foldscope, for gemological application.

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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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Gemstones and Minerals

Nestled within this huge textbook on analytical archaeometry is a useful chapter for today’s gem professional.

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Portable Instruments and Tips on Practical Gemology in the Field

Buying gems or jewelry can be challenging even when one has access to a fully equipped lab.

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Gem-Quality Yellow-Green Haüyne from Oldoinyo Lengai Volcano, Northern Tanzania

Yellow-green to green-yellow gem-quality haüyne was found for the first time in an alkaline plutonic rock.

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