Details the colors and optical effects caused by metallic copper inclusions in this gem-quality feldspar.

Reports on the geological setting and gemological properties of violet-blue gem cordierite from new deposits located in British Columbia.

Examines dissolution features of heliodor and green beryl from a Ukrainian pegmatite field and offers criteria to distinguish them from samples found in other localities.

Investigates the various chromophores responsible for color in four types of yellow sapphire.

A report on the seventh annual Chicago Responsible Jewelry Conference.

A Guatemalan jade called yongchuliao has gained popularity among Chinese buyers.

A precipitation of an unidentified mineral creates a complex moiré pattern in a fissure of a purple spinel.

The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.

Large near colorless, blue, and yellow diamonds broke auction records at Christie’s and Sotheby’s in the first half of 2022.

Both asterism and chatoyancy are observed in a color-change sapphire.

After a slow start, the spring 2023 auction season ends with multiple broken records.

The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.

GIA president and CEO Susan Jacques receives the American Gem Society’s highest honor.

An intriguing metallic inclusion is observed in a faceted garnet.

The Nineteenth Annual Sinkankas symposium, held at GIA’s Carlsbad, California campus, focused on gems and minerals of San Diego County.