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.

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

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

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

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