Explores the geology, production, and yield of the world’s most commercially important ruby deposit.

An introduction to Moroccan amethyst, which features distinctive color zoning and inclusions.

Offers geological context and gemological characterization of this increasingly popular vivid blue spinel from northeast Vietnam.

A gemological examination of chrysocolla in quartz from Tucson’s AGTA show.

Emerald from the Belmont and Montebello mines of Minas Gerais, Brazil seen at the GJX show in Tucson.

A discussion of the current demand for tsavorite and spinel in today’s market.

Rare material seen at the GJX show in February 2015.

Exceptional innovations using gem and mineral rough at Tucson’s GJX show.

The New York lab discovers a synthetic melee diamond in a pendant, underscoring the importance of testing for undisclosed synthetics.

Examination of the largest HPHT synthetic diamonds GIA has examined so far demonstrated significant progress in this growth technology.

The New York lab investigates the use of the shells of Tridacna species as imitation pearls.

A uniquely carved tourmaline suite on display in Tucson.

GIA’s Bangkok lab investigates the gemological properties of Moroccan amethyst.

An up-close look at the cultured pearl’s role in the gem and jewelry industry.

Prismatic blue and colorless dumortierite inclusions in rock crystal quartz are examined for the first time in the Carlsbad lab.