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

Beads are identified as quartz with polymer.

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

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 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.

Some unusual gem material featured at the GJX show in Tucson.

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

Rare material seen at the GJX show in February 2015.

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

A uniquely carved tourmaline suite on display in Tucson.

Examination of two chameleon diamonds reveals color enhancement through artificial irradiation.

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

A Fancy black round brilliant diamond has an inclusion that is revealed to be a natural diamond crystal.

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.

A purple non-nacreous specimen is revealed to be a natural northern quahog pearl.

GIA's Bangkok lab investigates the coloration and gemological properties of this striking mineral specimen.