Sapphire Rush Near Ambatondrazaka, Madagascar (英語)
A newly found deposit of sapphire in Madagascar is explored.
X-ray Computed Microtomography: Distinguishing Natural Pearls from Beaded and Non-Beaded Cultured Pearls
The distinction of natural from cultured pearls traditionally has been based on X-radiography.
Preview of Nature Art Science with Paula Crevoshay
Tairus Hydrothermal Synthetic Sapphires Doped with Nickel and Chromium
Paraíba-Like Synthetic Sapphire
Two flame-fusion synthetic sapphires with a Paraíba-like color are examined at GIA’s Carlsbad lab.
Gemstone Artisan Keycaps
New Fluorite Deposit in Nigeria
Update on Ammolite Production from Southern Alberta, Canada
Oregon Sunstone Update
37th International Gemmological Conference
A report from the 37th IGC, held in late October 2023 in Tokyo.
Fall 2023 Auction Highlights
Large blue and pink diamonds were among the top lots of the fall auction season, including the most expensive auction jewel of 2023.
G&G Contributors Awarded for Best Geoscience Research
Yellow Mn-rich Tourmaline from the Canary Mining Area, Zambia
Sapphire and Garnet from Kalalani, Tanga Province, Tanzania
Bismuthinite Inclusions in Rose Quartz from Madagascar
Polymer-Impregnated Turquoise
A large “Persian” turquoise cabochon was impregnated with a material that was also present in cavities on its base.
Characterization of Emeralds from a Historical Deposit: Byrud (Eidsvoll), Norway
An emerald deposit at Byrud, in southern Norway, yielded significant quantities of crystals and gem rough in the late 19th and early 20th centuries.
DNA Barcoding and Next-Generation Sequencing (NGS) of Freshwater Pearls
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