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A face-up view of a cushion cut diamond with blue color.

Article

Gems & Gemology’s 7 Most Unusual Encounters from 2019

Stuart Overlin, Brooke Goedert and Kellie Giordano, December 13, 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

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.

Article

Diamond Research Gives Clues to the Formation of the Continents

Karen V. Smit, April 25, 2019

Mineral inclusions trapped in diamonds reveal the continents’ construction – and help GIA researchers date diamonds.

The Gemmological Properties of the Sumitomo Gem-Quality Synthetic Yellow Diamonds

James E. Shigley, Emmanuel Fritsch, December 1, 1986

Sumitomo Electric Industries is producing gem-quality synthetic yellow diamonds in deep yellow single crystals in sizes up to 2 ct.

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