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

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

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.

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

Fiber-optic illumination reveals rectilinear zigzag-patterned films with vibrant colors in a blue sapphire.

Trigons and tetragons observed in a chameleon diamond indicate both octahedral and cubic growth.

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.

A report on the seventh annual Chicago Responsible Jewelry Conference.

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

Explores eclogitic diamonds, which make up a significant portion of the gem diamond market, and what they reveal about Earth’s dynamic processes.