featured Research & News


Imitation Cat’s-Eye Pen “Pearls”

Imitation pearls show kaleidoscopic colors with illumination.
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Gem News International

Conversation with Gemfields

An exclusive interview with Ian Harebottle, CEO of Gemfields.
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Washing process at Mustang.
Gem News International

New Ruby Miner in Mozambique

A new mining operation in Montepuez is profiled.
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Green HPHT synthetic diamond.
Lab Note

HPHT Synthetic Diamond with Intense Green Color

Nickel is found to contribute to the color of a synthetic diamond seen in the New York lab.
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Flashes and Flames in Ethiopian Opal

Chatoyancy, rarely seen in play-of-color opal, is observed in Ethiopian material.
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