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A large yellow cushion cut diamond pendant is partially framed with marquis cut diamonds and hangs from a necklace of mixed cut diamonds.

Article

Yellow Gemstones: Can You Identify Them?

Sharon Bohannon, March 9, 2020

Don’t judge a yellow gem by its colour alone. A variety of gemstones also come in shades of yellow, from diamonds to citrine to garnets.

Article

Diamond Lattice Defects: GIA Researchers Explore Internal Tagging and Grey-Blue-Violet Diamond Colour

Amanda J. Luke, February 10, 2020

GIA scientists recently presented their latest research on diamond tagging and the cause of grey-blue-violet colour in diamonds.

A row of various shaped cut and polished pink diamonds.

Article

Why are Pink Diamonds Pink? GIA Researchers Dive Deep into their Crystal Structure

Russell Shor, October 18, 2019

GIA researchers analysed more than 90,000 natural pink diamonds to better understand how these rare and beautiful diamonds formed and got their colour.

Diamond Sources and Production: Past, Present and Future

Alfred A. Levinson, John J. Gurney, December 1, 1992

Diamond production’s future appears to belong less to Africa and more to Australia, Canada and the Russian Federation, according to this overview of geologic trends in the industry.

An Investigation of a Suite of Black Diamond Jewellery

Robert C. Kammerling, Robert E. Kane,, December 1, 1990

This article reports on the gemmological properties of six large black diamonds set in a suite of jewellery.

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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