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.
Sapphire and Garnet from Kalalani, Tanga Province, Tanzania
DNA Barcoding and Next-Generation Sequencing (NGS) of Freshwater Pearls
Bismuthinite Inclusions in Rose Quartz from Madagascar
Japanese Jadeite Tables
The Cause of Iridescence in Rainbow Andradite from Nara, Japan
“Rainbow” andradite from Nara, Japan, occurs as relatively small orangy brown crystals that show attractive iridescence in almost the entire range of the spectrum.
Letters: Nacken Synthetic Emeralds: Additional Information
Finds from the Secondary Market
Dave Bindra shows some noteworthy pieces he obtained on the secondary market and shares his thoughts on the state of the colored stones market.
Multi-Generation Cutting Family from Idar-Oberstein
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
Oregon Sunstone Update
Yellow Mn-rich Tourmaline from the Canary Mining Area, Zambia
Citrine from Zambia
Elements in Synthetic Overgrowth on Flux-Heated Ruby and Beryllium-Diffused Sapphire
Synthetic overgrowth caused by two different types of treatment are found on two samples in the Tokyo lab.
Rainbow-Colored Partially Healed Fissure in Blue Sapphire
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