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Research & News
Industry Analysis
Trade Wars Dampen Hong Kong Shows
Business at the September Hong Kong Gem and Jewellery Shows was spotty, despite a strong world economy. Buyers left early to avoid Typhoon Mangkhut.
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Gem News International
Twelve-Rayed Star Sapphire from Thailand
A black star sapphire produced from eastern Thailand, showing both golden and silver rays, is studied at GIA’s Bangkok lab.
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Micro-World
Microlite Crystals in Topaz from Pakistan
Aesthetically pleasing inclusions are found in topaz from Pakistan’s Shigar Valley.
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Press Release
New Mineral Named in Honor of Gemology Pioneer
Researchers at GIA, in collaboration with researchers at the University of Padova, recently discovered crowningshieldite, a new mineral named in honor of G. Robert Crowningshield, a pioneering figure in gemological research for more than 50 years at GIA.
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Lab Notes
Large HPHT-Treated Blue Type IIb Diamond
Properties of, and theories on color zoning exhibited by, the largest HPHT-treated blue diamond graded by GIA.
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Lab Notes
Two Natural “Horse Conch” Pearls
Rare pearls, along with their shell, are studied in the Hong Kong lab.
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