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How GIA Grades Diamonds

Learn about GIA's processes to ensure the most accurate and ethical diamond grading results.

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GIA Blockchain Diamond Grading Report

GIA is now using blockchain technology to deliver secure, digital diamond grading reports. This report service delivers the same independent, accurate and unbiased grading analysis as the GIA Diamond Grading Report and Diamond Dossier® services in a digital format.

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Fee Schedules

A list of fees by service in 8 currencies.

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People meet and mingle at the entrance to the JCK Show.
Article
Headwinds Slow 2019 Vegas Business, Lab-grown Diamonds Proliferate

Decent demand for finished jewellery, but less for loose gems. Plus: Lab-grown diamonds and responsible, sustainable business practices.

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Six people sit on chairs on a stage in front of an audience.
Article
GIA JCK 2019 Panel: Consumers Care Where Their Jewellery Comes From

Consumers want to know that the components of their jewellery – gemstones, diamonds and precious metals – are responsibly sourced.

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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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GIA iD100® Gem Testing Device

With the growing availability of synthetic diamonds in the marketplace, full disclosure and confidence in knowing what you are buying is now more important than ever. GIA has developed a sophisticated and easy-to-operate desktop instrument to screen for these stones.

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GIA Website Privacy Notice

GIA Website Privacy Notice

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GIA Laboratory Client Agreement

To submit any item to GIA for analysis and grading services, you will need to submit a completed Client Agreement with your first shipment.

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Red spinel, Burma ruby
Article
A Case of Mistaken Identity?

Don’t judge a gem by colour alone. Many clues can help you identify gems of similar colours.

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