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.

Gemstones formed in metamorphic environments offer insights into the earth’s history and the evolution of tectonic activity that led to their formation.