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Chameleon diamond before and after heating
Chameleon Diamond with Nickel Absorption Band

A rare chameleon diamond is examined in GIA's Carlsbad lab.

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A Gemmological Study of a Collection of Chameleon Diamonds

Chameleon diamonds are among the rarest of gem diamonds.

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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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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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The 187.63 ct Foxfire rough diamond.
The Foxfire Diamond, Revisited

The 187.63 ct rough diamond from Canada’s Diavik mine shows surprising reactions to ultraviolet light.

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Loose and mounted green diamonds.
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Exhibition Review: Green Diamonds: Natural Radiance

Review of Green Diamonds: Natural Radiance at the Natural History Museum of Los Angeles.

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DiamondView images show the fluorescence in two unusual diamonds.
Two Natural Type IIa Diamonds with Strong Phosphorescence and Ni-Related Defects

Natural diamonds exhibit characteristics normally seen in synthetic material.

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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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Recently discovered and legendary diamonds in the blue/gray/violet color range
Natural-Colour Blue, Grey and Violet Diamonds: Allure of the Deep

Summarises data collected on more than 15,000 natural blue/grey/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this colour range.

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Fancy Dark brown to Fancy black Marange diamonds
Black Diamonds from Marange (Zimbabwe): A Result of Natural Irradiation and Graphite Inclusions

Characterises a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.

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