The author acquired an alluvial rough diamond from Guyana showing unique surficial features that do not appear to have been documented elsewhere.

At the AGTA show, Rod and Nathaniel Cook of Washington Jade (Edmonds, Washington) told us about shifting their focus to cat’s-eye blue and bluish green nephrite jade.

A maze-like pattern is observed in spinel from Vietnam.

The New York laboratory reports on a new record size for CVD laboratory-grown diamond.

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.

160 ct yellow sapphire rough from Sri Lanka.

The finale of a two-part series on the mining history of Austrian emerald deposits in the Habachtal region.

Sellers and buyers alike were delighted to be back at Tucson for the show season after a two-year absence.

Four-billion-year-old meteorite carved into a life-sized human skull draws attention at the 2022 AGTA show.

The first installment of this column explores the potential role of modern-day deep-focus earthquakes on diamond growth.

Approaching his 50th anniversary in the business, Stephen M. Avery (Lakewood, Colorado) reflected on his journey to becoming an award-winning lapidary artist, detailing his signature cuts and gem sets and offering advice to up-and-coming gemstone cutters.

At the AGTA show, we spoke with Natassa Patel, who along with her mother, Salma, owns and operates True Blue Opals and Gems.

Custom knife maker Loren Feldman details his craft, including his use of rare and fascinating materials such as gem dinosaur bone and meteorites.

Meghan Simmons, a graduate of GIA’s Jewelry Design program at the Carlsbad campus, received the fifth annual Gianmaria Buccellati Foundation Award for Excellence in Jewelry Design.

Characterizes yellow topaz from this historical source, with particular emphasis on its photo luminescence behavior.

An overview of the Spring 2022 Gems & Gemology content.

After 15 years in the making, Jeffrey Bilgore’s stunning blue sapphire pendant makes its debut at the AGTA show.

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.

GIA’s New York laboratory reports on a 15.10 ct (17.47 × 11.53 × 7.94 mm) Fancy Vivid blue cut-cornered rectangular step cut named the De Beers Cullinan Blue diamond.

GIA, the leader in gemological research, education and science-based gem identification and grading services, is expanding its gem origin services to provide retailers and consumers with the diamond source information they demand.