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Gemstones

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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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The entrance to the GemGenève show featured a large graphic wall.
Article
Trade Hopes for a Bright 2019 Vegas Show

All eyes are on the upcoming jewellery sales events in the US – the Luxury and JCK shows in Las Vegas – as business slows down in other parts of the world.

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A model holds a large cut-corner square diamond with three fingers.
Article
De Beers Ups Supply; US Federal Trade Commission Warns About ‘Eco’ Claims

DeBeers responds to fluctuations, and the FTC issues warnings on laboratory-grown diamonds. Plus: 302.37 ct Graff Lesedi La Rona is revealed.

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A diagram uses four rulers to show how color, clarity, cut and carat weight are measured.
Article
Diamond Quality: A Short History of the 4Cs

You’ve heard about the 4Cs of diamond quality (colour, clarity, cut and carat weight). But how did they become so well-known? Here’s a little diamond history.

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Indian necklace
Article
Jewellers to the Maharajas of Jaipur and Modern-Day Moguls

Enter a world not well-known in the West—the world of the maharajas and their jewellery, coveted by the modern-day moguls of business, entertainment and royalty. See the fantastic works of art made today in the form of enamelled Kundan meena jewellery and the regal look of polki diamonds.

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Worker attaching wax forms
Article
Shenzhen: The Frontier of China’s Gem and Jewellery Industry

All jewellery professionals are familiar with the city of Shenzhen, a global jewellery manufacturing centre and a leader of China’s fast-growing gem and jewellery industry. Join the GIA team as we tour the city and discover more about its leading jewellery brands.

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Article
Diamond Cut: Anatomy of a Round Brilliant

Jewellers and gemmologists use a specific set of terms to describe parts of a polished diamond. Certain measurements of the shape or proportions ultimately have an affect on the round brilliant diamond’s cut grade.

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Article
Diamond Cut: The Wow Factor

Learn the basics of the GIA Cut Grading System for round brilliant cut diamonds to help pick out your perfect diamond.

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Article
Cut: The 4th C

GIA began issuing reports that included a cut grade for round brilliant diamonds in 2006 in an effort to establish standards for cut in the same manner as it has for colour and clarity. This grading system is based on research conducted over the previous decade which was chronicled in several articles published in Gems & Gemology.

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Shane McClure
Article
Fascinating Finds from the GIA Lab

Shane McClure discussed the unique finds he has seen during his time at GIA at the AGS Conclave in San Diego.

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