featured Research & News

Industry Analysis

De Beers Reduces Rough Prices – Too Little?

Rough prices and quantities drop, undisclosed treated diamonds and auction sales break records − again.
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Book Review

Wonders Within Gemstones II

The author shares how he uses various lighting methods on gemstones to find “invisible” inclusions.
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Research & News

2 Large HPHT-Grown Synthetic Diamonds

Examination by GIA’s Hong Kong lab reveals significant progress in this growth technology.
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Alumni Profile

Grad Buys Headline-Grabbing Fancy Diamonds

Shmulik Polnauer buys Prosperity Pink, Pink Promise and Purple Orchid for Israel’s Leibish & Co.
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Feature Article

Searching for Sapphire in Tasmanian Wilderness

Field gemologists journey to Tasmania to gather sapphire samples for GIA’s reference collection.
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