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Showing 13 results for "chameleon diamonds"

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Fancy black NPD synthetic diamond
Fancy Black NPD Synthetic Diamond

Paul Johnson and Kyaw Soe Moe, April 30, 2014

Testing reveals the first synthetic nano-polycrystalline diamond (NPD) to be detected by a gem lab.

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Largest blue HPHT synthetics
Article
Large Blue and Colourless HPHT Synthetic Diamonds

Wuyi Wang and Terry Poon, May 27, 2016

Five large HPHT synthetic diamonds, examined at GIA’s Hong Kong lab, indicate the advances that HPHT growth technology has made in quality and size.

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G&G Brief presents an overview of the content of the Fall 2015 issue of Gems & Gemology.
Article
Autumn 2015 G&G: Trapiche Emeralds, Synthetic Diamonds and a Large Diamond Source

Russell Shor, November 4, 2015

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

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Fall 2016 Gems & Gemology Cover
Article
Autumn 2016 G&G: CVD Synthetic Diamonds Survey, Reversible Colour Change in Blue Zircon

Jennifer-Lynn Archuleta, October 31, 2016

A summary of the content found in the Autumn 2016 issue of Gems & Gemology.

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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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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.

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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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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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Confusing, Triangular Inclusions in an Art Deco-Style Pin
Spring 1991 G&G Lab Notes

March 1, 1991

This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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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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