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

Tubular three-phase inclusions are observed in a Colombian emerald.

A carved jade pendant displaying both dark green omphacite and paragenetic yellow vesuvianite is examined.

Examination of a brown nacreous pearl reveals a pair of foraminifera-like spheres.

DiamondView imaging revels a cross-shaped fluorescence pattern in a natural diamond.

A Fancy Deep brownish orange treated HPHT-grown diamond exhibits multiple defect concentrations in various growth sectors.

A feather observed in a natural diamond resembles a large reptile.

The Carlsbad lab examines a rare submission of a Fancy Dark brown diamond containing carbon dioxide.

Heat treatment leaves a stunning circular stress fracture in amber.

A tapered baguette-cut diamond exhibits two major color zones.

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

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.

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.

An overview of the Winter 2023 Gems & Gemology content.

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

An overview of the Winter 2023 Gems & Gemology content.

The GIA New York laboratory is now accepting GIA graded diamonds for the same-day confirmation service that was announced on January 9.