A rare occurrence of 14 trapiche patterns is observed in a garnet sample from Vietnam.

Documents the gemological properties, chemical composition, and appearance of petrified tree fern discovered in northeast China.

Explores the formation of sedimentary rocks, gems found and formed in sedimentary environments, and the alluvial mining of these gems.

A comprehensive look at Texas topaz, detailing its gemological and compositional characteristics and providing a basis for using trace element concentrations to identify its origin.

Provides a visual guide to the internal features of different varieties of beryl.

Reports on the recent production of precious and common opal from a centuries-old locality.

Examines a technique for setting cut garnets on glass objects, invented by Claudius vom Creutz of Nuremberg in the late sixteenth century.

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.