Research Article Search Results
Three-Rayed Asterism in Quartz
Rare optical phenomenon observed in four star quartz cabochons from Brazil.
Extraterrestrial-Like Inclusion in Mozambique Ruby
A 3.03 ct stone submitted to GIA’s Bangkok laboratory was identified as a ruby from Mozambique with no indication of heating.
Rare Blue Apatite Inclusion in Smoky Quartz
A very light blue hexagonal apatite inclusion is observed in natural smoky quartz.
Mercury Free Mining Pilot Program
Complex Fluid Inclusion in Topaz
A blue topaz recently examined by the authors contained an interesting and complex fluid-filled negative crystal that revealed some remarkable behavior when cooled down.
History of Emerald Mining in the Habachtal Deposit of Austria, Part II
The finale of a two-part series on the mining history of Austrian emerald deposits in the Habachtal region.
Skull Carved of Meteorite
Four-billion-year-old meteorite carved into a life-sized human skull draws attention at the 2022 AGTA show.
Tucson 2022 Overview
Sellers and buyers alike were delighted to be back at Tucson for the show season after a two-year absence.
YAG with Flux-Filled Fingerprints
The author recently examined a 3.58 ct yellowish green yttrium aluminum garnet, a manufactured product known in the trade as “YAG,” that contained numerous large flux-filled fractures.
Deep-Focus Earthquakes: The Heartbeat of a Diamond Factory?
The first installment of this column explores the potential role of modern-day deep-focus earthquakes on diamond growth.
