Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
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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 diamond examined in the Carlsbad lab shows chameleon colouring in an unusual pattern.
Read MoreReviews diamond discoveries at the Lomonosov deposit, as well as the geology of the Arkhangelsk kimberlite province.
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A cape diamond examined in the New York lab shows rare yellow phosphorescence.
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The decay of the transient 2800 cm–1 absorption peak in a Fancy grey diamond is observed.
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A natural Fancy Intense blue diamond submitted to the New York lab shows the highest boron concentration ever reported in a natural specimen.
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G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.
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On Oct. 7 in Hong Kong, a 118.28 ct D-Flawless sold for more than $30 million, becoming the most expensive colourless diamond ever sold at auction.
Read MoreThis section, from the Summer 1992 issue of Gems & Gemmology, is a compilation of interesting finds from GIA's laboratories.
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