Explore nature’s diamond sculptures—264 rare rough diamonds examined by GIA scientists for their unique shapes and raw brilliance.

Phenomenal gemstones dazzle with unique optical effects like iridescence and play-of-color. Discover how your favorite gem phenomena actually work.

An overview of the Winter 2025 Gems & Gemology content.

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

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

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

Microscopic examination reveals intriguing growth tubes in a copper-bearing tourmaline.

A perfectly shaped euhedral tourmaline crystal is identified in a faceted tourmaline.

The blunt termination of a red manganotantalite inclusion displays a striking contrast against a greenish blue sapphire.

An aquamarine crystal from Pakistan contains a pseudomorphic quartz inclusion.

Dense tube inclusions in emerald create a scene reminiscent of a tranquil bamboo forest.

A semi-baroque saltwater nacreous pearl presents identification challenges in the Mumbai laboratory.

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

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

A large faceted cuprite is examined at the Carlsbad laboratory.

An undrilled black bead is identified as an assembled imitation pearl made from shell fragments.

The date and topic of the 2026 Sinkankas Symposium is announced.

A snuff bottle submitted to TULAB as jadeite jade is identified as a dolomite aggregate with fuchsite.

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