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

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, 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.

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.

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.

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.

CARLSBAD, Calif. – Monday, Feb. 14 – The fifth annual Gianmaria Buccellati Foundation Award for Excellence in Jewelry Design was presented on Feb. 4 to GIA graduate Meghan Simmons from the GIA Carlsbad campus.

Remarkable “horsetail” inclusions discovered in a demantoid garnet, while their origin and composition remain under discussion.

The Tokyo lab recently identified a unique localized distribution of cloud-like inclusions in a chrysoberyl.

Nacreous pearls are known to have platelet growth resembling fingerprints or topographic maps, but a less common appearance is nacre with a concentric spiral pattern.

Analysis of a transparent yellow angular crystal inclusion in a Brazilian rock crystal quartz host suggests monazite.

A reported new source of blue zircon in Malawi yields rough material for beautiful finished stones in the gem trade.

Examines the mining and the internal, spectroscopic, and chemical features of peridot from this deposit, which possesses a rich olive green color and is available in large sizes.

One of the more subtle inclusion scenes gemologists sometimes observe in natural diamonds is the presence of crystallographically oriented structural defects known as “internal graining.”

Contributes to the mining history of Austria’s Habachtal region, which is believed to be one of the earliest emerald deposits.