Indonesian purple chalcedony containing interesting native copper inclusions is a first for the Carlsbad lab.

A composite of synthetically grown and natural diamond was recently identified by the Carlsbad laboratory.

The age of something is fundamental. Humans, animals, wine, cars, and antiques are viewed and understood in the context of their age.

The examination of a nearly complete trapiche emerald crystal–which are difficult to obtain–is consistent with the findings of previous studies.

One of the most striking materials encountered in the Riverpark Inn (Pueblo) Gem Show was “rainbow lattice.”

An update on the activity at Potentate’s Montana deposits.

A unique doublet displaying a yellowish chatoyant sheen is examined by the Tokyo lab.

A gem dealer gives back to the mining communities that have supplied gems over the course of his career.

A 283.74 ct rough tsavorite from Merelani, Tanzania, yields a square cushion-cut gemstone weighing 116.76 ct.

Spinel is often inclusion free but occasionally showcases unusual inclusions.

A summary of “The Ethics of Jewelry” panel, held at New York’s Metropolitan Museum of Art on January 25, 2019.

A graduate of GIA’s Jewelry Design program in Taiwan is the recipient of the Buccellati Award.

At the AGTA show, Rod Griffin (Rod Griffin Boulder Opals, Silverado, California, and Queensland, Australia) told us that the world market for all types of opals continues to be strong, but Australia’s opal industry is shrinking due to the costs, challenges, and changing regulations of mining.

Eye-catching stones at Jeffrey Bilgore’s AGTA booth.

Presents a simplified but comprehensive classification of gem tourmaline species based on quantitative measurement of six common major elements.