Research & News
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.
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.
Microlite Crystals in Topaz from Pakistan
Aesthetically pleasing inclusions are found in topaz from Pakistan’s Shigar Valley.
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.
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.
Two Natural “Horse Conch” Pearls
Rare pearls, along with their shell, are studied in the Hong Kong lab.