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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 row of various shaped cut and polished pink diamonds.
Article
Why are Pink Diamonds Pink? GIA Researchers Dive Deep into their Crystal Structure

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 round, bright red gem displayed on a dark gray background.
Article
The Red Hot Gems of Summer

These red, pink and orange hued gems evoke passion and excitement – and are sure-fire accessories for sultry summer days.

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Parallel bands of green color at room temperature.
Uncommon Parallel Colour Zoning in a Chameleon Diamond

A diamond examined in the Carlsbad lab shows chameleon colouring in an unusual pattern.

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The examined Fancy Intense blue diamond
Intense Blue Diamond with Very High Boron Concentration

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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Yellow-green cape diamond.
Cape Diamond with Yellow Phosphorescence

A cape diamond examined in the New York lab shows rare yellow phosphorescence.

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Decay Kinetics of Boron-Related Peak in IR Absorption of Natural Diamond

The decay of the transient 2800 cm–1 absorption peak in a Fancy grey diamond is observed.

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Fancy-color diamonds from Lomonosov, Russia.
Geology and Development of the Lomonosov Deposit, North-Western Russia

Reviews diamond discoveries at the Lomonosov deposit, as well as the geology of the Arkhangelsk kimberlite province.

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The 30.03 ct oval Juliet Pink diamond hangs from a necklace of 98.70 cts of round brilliant, pear and marquise cut colorless diamonds.
Article
LA Museum Hosts Rare Fancy Coloured Diamond Exhibition

Some of the world’s rarest fancy coloured diamonds are on display in Los Angeles until March 2017 − but you can see some photos of them here.

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Fluorescence Spectra of Coloured Diamonds Using a Rapid, Mobile Spectrometer

Numerous natural-colour coloured diamonds from the Aurora Butterfly of Peace and other collections were studied using a new type of fluorescence spectrometer.

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