Discusses the unusual surface characteristics of ekanite from secondary deposits in Sri Lanka.

This installment of “Colored Stones Unearthed” explores inclusions in gems—how they form, how they are studied, and what they mean for gemologists and geoscientists.

Offers the first detailed summary of amber from the Vietnamese island of Phu Quoc and a comparison with Baltic, Dominican, and Burmese material.

Rare optical phenomenon observed in four star quartz cabochons from Brazil.

A lab in Bangkok shares study on color stability in yellow sapphire.

A fascinating diamond crystal inclusion displaying a transparent, ghost-like appearance is identified in a Faint green diamond.

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.

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

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

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.

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.

A look at Harvey Liberman’s career as a renowned diamond cutter in New York’s Diamond District.

A very light blue hexagonal apatite inclusion is observed in natural smoky quartz.

A 3.03 ct stone submitted to GIA’s Bangkok laboratory was identified as a ruby from Mozambique with no indication of heating.

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.

Researchers examine six specimens of banded turquoise, obtained through long-term cooperation of local miners in Zhushan County.