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A piece of diamond rough with green body color and triangular etchings on the surface.
Article
GIA Researchers Reveal the Secrets of Diamond-in-a-Diamond Mystery

GIA researchers in New York recently had the opportunity to examine one of the most interesting and unique diamond crystals ever found.

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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

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

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A row of various shaped cut and polished pink diamonds.
Article
Why are Pink Diamonds Pink? GIA Researchers Dive Deep into their Crystal Structure

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

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CVD, HPHT and Natural Diamonds
Article
Is There a Difference Between Natural and Laboratory-Grown Diamonds?

Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference

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A woman sits in front of a computer screen with the DiamondView to her right.
Article
Inside De Beers’ Lightbox Diamonds

GIA researcher analyses and confirms that De Beers’ Lightbox diamonds are grown using the chemical vapour deposition process.

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The 187.63 ct Foxfire rough diamond.
The Foxfire Diamond, Revisited

The 187.63 ct rough diamond from Canada’s Diavik mine shows surprising reactions to ultraviolet light.

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Diamond with uneven “lizard skin” surface texture.
Lizard Skin on Deformed Diamond

The surface texture of a diamond is affected by the gemstone’s structure.

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Article
Melee: Building Blocks of Contemporary Design

Learn about the versatility of melee in jewellery design and how to design and engineer long-lasting jewellery using the GIA Quality Assurance Benchmarks.

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Article
The Unexpected Origins of Big Diamonds

Dr Evan Smith, Ph.D., GIA research scientist, has dedicated his work to methodically characterising the inclusions found in rare diamonds. In this video presentation recorded at the 2017 JCK Las Vegas show, Smith shares his findings on the unexpected ori

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Yellow-green cape diamond.
Cape Diamond with Yellow Phosphorescence

A cape diamond examined in the New York lab shows rare yellow phosphorescence.

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