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Man stands at a podium in front of a room of people.
Article
What Country Do My Diamonds and Other Gemstones Come From?

Dr James Shigley shares how GIA determines coloured stone origin and the mysteries of diamond origin.

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Three round brilliant diamonds in a row
Article
GIA Researchers Evaluate ‘Light Performance’ and Diamond Cut

The phrase “light performance” gets a lot of loose use in the diamond trade, but what does it mean when someone is actually looking at a diamond?

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Three men at a conference table.
Article
A Look Back — and Forward — After 40 Years in the Gem and Jewellery Industry

Russell Shor reflects on the people, gems and stories he’s encountered as he’s covered the industry over the years.

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A large yellow cushion cut diamond pendant is partially framed with marquis cut diamonds and hangs from a necklace of mixed cut diamonds.
Article
Yellow Gemstones: Can You Identify Them?

Don’t judge a yellow gem by its colour alone. A variety of gemstones also come in shades of yellow, from diamonds to citrine to garnets.

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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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Patrick O’Shea stands in front of a staircase at the Javits Center in New York City.
Article
The Curious Life of Patrick O’Shea: From Ballistics Detective to Gemmologist and Jewellery Designer

Patrick O’Shea’s life’s journey led him down many career paths until they all came together as a designer who specialises in masonic jewellery.

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A multi-diamond brooch.
Article
2019 in Review: Diamond Trade Begins Recovery, Jewellery Retail Sector Blooms Late and Extraordinary Auction Sales

2019: A year of ups and downs in the gem and jewellery industry, including diamonds, retail, auction sales and laboratory-grown diamonds.

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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 rectangular cut Fancy Deep blue diamond is framed by two pear shaped diamonds.
Article
Diamond Market in Recovery and Top-End Auction Results

World’s two largest diamond producers say market is stabilising after several months of severe cutbacks in rough sales. Christie’s and Sotheby’s sales.

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A diamond necklace that features a 100.02 Fancy Intense yellow diamond. The pendant is done in the shape of a musical instrument.
Article
Bullish Predictions for 2019 Seasonal Sales Despite Concerns; Sotheby’s Hong Kong Auction Sales

US seasonal sales predictions are better than expected. Sotheby’s Hong Kong auction features a 100 ct yellow diamond necklace by GIA alumna Anna Hu.

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