The Carlsbad laboratory reports on a rare submission of orangy red translucent friedelite.

GIA studies a selection of rough and cut garnet from a new source in northern Vietnam.

Spiral patterns of nacre platelets observed on the surface of a non-bead cultured pearl are reminiscent of fingerprints.

GIA offered a variety of hands-on sessions for attendees during the Converge conference.

Near-colorless heulandite crystals in an Ethiopian opal resemble the segmented bodies of worms.

The Mumbai laboratory reports on a jewelry submission containing fracture-filled diamonds.

An overview of more than 30 posters presented at the Converge conference.

A large faceted cuprite is examined at the Carlsbad laboratory.

Colorful thin film inclusions are captured within a Russian emerald carving.

Armenite is submitted for the first time to the Carlsbad laboratory.

A summary of presentations from 24 industry-leading experts at Converge.

An aquamarine crystal from Pakistan contains a pseudomorphic quartz inclusion.

An overview of the Winter 2025 Gems & Gemology content.

GIAは2026年1月1日、デザインを一新したカラーストーンレポートと新サービスを開始します。

GIA will launch redesigned colored stones reports and new services on January 1, 2026.

A study analyzing the thermal behavior of the 3161 cm^–1 IR feature in 10 natural corundum samples from various deposits.

Organic-rich material is observed through an opening in a hollow natural pearl.

A diamond octahedron from South Africa hosts a rare yellow-orange almandine-pyrope garnet crystal.

Natural pearl cores are used to simulate the appearance of natural pearl growth in two assembled pearls mounted in a pair of earrings.