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Curves and Optics in Nontraditional Gemstone Cutting
Molybdenite in Topaz
Emerald Dealing in Afghanistan
Forsterite in a Purple Tanzanian Spinel
Update on Liberian Ruby
Emeralds of the Panjshir Valley, Afghanistan
Update on the Green Dragon Demantoid Mine in Namibia
37th International Gemmological Conference
A report from the 37th IGC, held in late October 2023 in Tokyo.
Radioactive Irradiated Spodumene
Gamma ray spectroscopy revealed that a packet of spodumene from Brazil was radioactive.
15.53 ct Pearl Discovered in Edible Oyster from the Ostreidae Family
A large natural pearl discovered in an edible oyster offers insight to the scientific pearl community.
The 3309 cm–1 Series in Sapphire and Ruby: A Focus on FTIR Peak Position Variation
Investigates the correlations between peak positions in the 3309 cm–1 series with trace element concentrations for ruby, metamorphic and basalt-related blue sapphire, and laboratory-grown sapphire.