The annual Tucson shows always provide an illuminating window into the world of colored gem supply and demand

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

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.

Features a foldout chart containing representative visible spectra and photos of the major color categories of diamond.

Guided by their cultural heritage and powered by a rapidly growing domestic consumer market, Chinese designers are exerting a powerful influence on the global stage.

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

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.

Exceptional stones are recirculated and new production is showcased at the AGTA show in Tucson.

Rare material seen at the GJX show in February 2015.

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

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

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

Unique carvings in gems are displayed at GJX in Tucson.

Striking Tanzanian garnets showing color shifting at the Riverpark Inn (Pueblo) show in Tucson.

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

Color and size make a statement at this booth in Tucson.

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

At AGTA, exquisite jewelry pieces inspired by natural scenes were on view.