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

An examination of 45 gems from the coronation crown of Napoleon III, using nondestructive mobile spectroscopic and gemological testing methods.

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.

A glimpse at the rare gems recently on display at the Natural History Museum of Los Angeles County’s Brilliance: The Art and Science of Rare Jewels exhibit.

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

Reports on diamonds from Guyana’s alluvial deposits, including mining history and practices.

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

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

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.

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

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.

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

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

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

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

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.

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.