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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 group of rough sapphires encircle cut sapphires.
Article
Montana Yogo Sapphires’ Unique Gemology

A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.

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A man and woman shake hands during a career fair event. In the background is a GIA poster.
Article
Adapting to Changing Workplaces

GIA Career Service advisors offer tips on how to navigate the changing workforce and consumer attitudes for success in the gem and jewelry industry.

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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 analyzes and confirms that De Beers’ Lightbox diamonds are grown using the chemical vapor deposition process.

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Detail of pendant elements heart and palmette shows twisted wire details (probably cast) and granulation soldered on.
Article
A New Life for Revival Jewelry Styles: Archaeological, Renaissance and Egyptian

Revival jewelry is inspired from the past – and wearing it connects us to the rich history of the beginning of civilization.

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Vanadium and Chromium-Bearing Pink Pyrope Garnet: Characterization and Quantitative Colorimetric Analysis

This type of pink pyrope garnet, believed to have been mined in Tanzania, shows a distinct color-change phenomenon resulting from its unique chemical composition.

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Sapphires from Bingham Canyon (Utah) and Yogo Gulch
Gem Localities and Formation

Poster abstracts on “Gem Localities and Formation” from GIA’s 2018 International Gemological Symposium.

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Mozambican ruby with signs of heat Treatment
Colored Stones and Pearls

Poster abstracts on “Colored Stones and Pearls” from GIA’s 2018 International Gemological Symposium.

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Color distribution in nitrogen-doped CVD after irradiation and annealing
Diamond Identification

Poster abstracts on “Diamond Identification” from GIA’s 2018 International Gemological Symposium.

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Nephrite from Luodian, China
Gem Characterization

Poster abstracts on “Gem Characterization” from GIA’s 2018 International Gemological Symposium.

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