An HPHT-treated CVD-grown diamond displaying a blue growth band is examined in the Mumbai laboratory.

Vendors in Tucson exhibited Nigerian green beryl with concentrated color zones.

Examination of two chalcedony cabochons from a new source in Indonesia reveals an abundance of native copper.

A summary of the findings at the 2025 Tucson gem shows.

The Mumbai laboratory examines a modified pear portrait-cut natural diamond.

A large aquamarine crystal from Pakistan displays multiple eye-visible fluorite inclusions.

Investigates the correlations between peak positions in the 3309 cm–1 series with trace element concentrations for ruby, metamorphic and basalt-related blue sapphire, and laboratory-grown sapphire.

Archival research and gemological characterization reveal the geographic origin of two emeralds set in a pendant linked to Catherine de’ Medici, Queen of France from 1547 to 1559.

Crystal inclusions in a natural diamond resemble a unique scene.

Crystal inclusions in a natural diamond resemble a unique scene.

Crystal inclusions in a natural diamond resemble a unique scene.

Crystal inclusions in a natural diamond resemble a unique scene.

Crystal inclusions in a natural diamond resemble a unique scene.

Crystal inclusions in a natural diamond resemble a unique scene.

An overview of the Spring 2025 Gems & Gemology content.

A rare find of Moroccan amethyst with eye-visible fluid inclusions is spotted at the Pueblo show.

Presents the first scientific and historical study conducted on the 2.33 ct Winston Red, the fifth-largest known Fancy red diamond in existence.

Beginning later this year, GIA will start using descriptive terms to characterize the quality of laboratory-grown diamonds.

Beginning later this year, GIA will start using descriptive terms to characterize the quality of laboratory-grown diamonds