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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.

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Three cultured pearls, one natural
Real-Time Microradiography of Pearls: A Comparison Between Detectors

Stefanos Karampelas, Abeer Tawfeeq Al-Alawi, and Ali Al-Attawi, January 26, 2018

Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).

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Summer G&G 2015
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.

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A Mixture of Natural and Cultured Pearls
X-ray Computed Microtomography Applied to Pearls: Methodology, Advantages and Limitations

Stefanos Karampelas, Jürgen Michel, Mingling Zheng-Cui, Jens-Oliver Schwarz, Frieder Enzmann, Emmanuel Fritsch, Leon Leu, and Michael S. Krzemnicki

X-ray computed microtomography reveals the internal features of pearls in great detail.

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Five-strand Natural Pearl Necklace
X-ray Computed Microtomography: Distinguishing Natural Pearls from Beaded and Non-Beaded Cultured Pearls

The distinction of natural from cultured pearls has traditionally been based on X-radiography.

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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Autumn 2009

Brendan M. Laurs, Thomas W. Overton

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

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Abstracts; Winter 1991

Dona M. Dirlam

This article, from the Winter 1991 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Winter 2009

Brendan M. Laurs, Thomas W. Overton

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

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Abstracts; Autumn 1991

Dona M. Dirlam

This article, from the Autumn 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.

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The internal structures of natural pearls from the marine mollusk Pinctada maxima are the subject of the lead article in this issue. The scattered loose pearls on the cover are from Paspaley’s natural pearl collection, which includes one discovered in the 1970s at the Eighty Mile Beach fishing grounds
G&G Spring 2021 Edition
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