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

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

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Grading the Hope Diamond

One of the most popular exhibits at the Smithsonian Institution, the stunning Fancy Dark grayish blue Hope diamond was formally graded by GIA’s gem laboratory.

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

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

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The Magic of Colored Diamonds

Colored diamonds are in the spotlight. They’re routinely breaking records at auction houses. Learn more about these gemological marvels of the rarest order.

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A garimpeiro working  Mustang Resources’ concession.
Update on Mozambique Ruby Mining and Trading

Current activity and production at various sites around Mozambique are reported.

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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 surefire accessories for sultry summer days.

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LMR in diamond viewed with different illuminations.
Christmas Tree–Shaped Internal Feature In Diamond

A laser manufacturing remnant in a Fancy yellow diamond creates a unique 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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Fluorescence Spectra of Colored Diamonds Using a Rapid, Mobile Spectrometer

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

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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 Colored Diamond Exhibit

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

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