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

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

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

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

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

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

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

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.

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

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.

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.

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.

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

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

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.