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Man stands in front of an audience giving a lecture – projection screen with image to his right.
Article
Not All That Glitters is Gold — Sometimes it is Mozambican Rubies

Learn about Mozambican rubies, including their mining history, characteristics and market demand.

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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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A large group of people outside on GIA’s Carlsbad, California  campus.
Article
Guardians of Trust: GIA’s Innovative Research, Instruments and Services

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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Faceted wurtzite
Rare Faceted Wurtzite

A stone submitted for identification is revealed to be the first wurtzite examined by the GIA lab.

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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 repaired diamond.
A Repaired Diamond

A marquise-cut diamond is found to have been broken and reassembled with an unknown adhesive.

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An exceptionally large and clean 1.91 ct faceted oval brilliant afghanite.
Large Faceted Afghanite

A report on the largest facet-grade afghanite seen in the GIA gem identification department.

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