A rare and exceptional example of sodalite is studied in the Bangkok laboratory.

A spectacular display of hollandite crystals is captured within an amethyst cabochon.

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.

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

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.

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.

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

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.

An overview of the Winter 2023 Gems & Gemology content.

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

GIA’s Mumbai laboratory analyzes seed pearls decorating an Indian-style headdress.

Investigation of a tubular feature in a natural pearl reveals evidence of parasitic activity.