Color Grading of Colored Diamonds in the GIA Gem Trade Laboratory
A Pearl Identification Challenge
Two pearls presented a unique challenge, as testing at three different gemological laboratories could not conclusively identify them as natural or cultured, determine a freshwater or saltwater growth environment, or specify the producing mollusk.
Spectral Reflectance and Fluorescence Characteristics of Natural-Color and Heat-Treated “Golden” South Sea Cultured Pearls
A comparison study was made between the yellow and white nacre of the gold-lipped Pinctada maxima oyster shell and 65 yellow cultured pearls.
Demantoid Garnet with Giant Fluid Inclusion
“Electronic Device” in an Atypical Bead Cultured Pearl
GIA’s Hong Kong laboratory looks at a new radio-frequency identification (RFID) technology for tracking cultured pearls.
The First Identified Non-Nacreous Beaded Cultured Pearl
Liberian Ruby
A trip to a rural Liberian diamond mining community results in a newly discovered source of corundum.
Luminescent Synthetic Garnet-Like Crystals
New Tourmaline Pockets in San Diego County’s Pala District
New Find of Petroleum-Included Quartz from Madagascar
Exceptionally Rare Pearls from ECIJA
Sixth Annual Gianmaria Buccellati Foundation Award Winner
A graduate of GIA’s Jewelry Design program in London is the recipient of the 2022 Gianmaria Buccellati Foundation Award.
Sweet Home Mine Rhodochrosite from 1888
A rhodochrosite on display at AGTA dates back more than a century to Colorado’s Alma Mining District.
YNY Jewels: Designer Surbhi Pandya
Handcrafted jewelry pieces featuring tanzanite carvings stood out at the GJX show.
Yellow Topaz from Germany, Emerald Mining in Austria’s Habachtal Region, a Return to Tucson, and More…
Blue Sapphire Lord of the Rings Pendant
Mercury Free Mining Pilot Program
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