A unique inclusion scene caused by devitrification is observed in artificial glass.

Gersdorffite inclusions in quartz exhibit either triangular or hexagonal shapes when viewed from different directions.

A non-nacreous pearl with a netted surface resembles the exterior of a melon.

Play-of-color pattern in Ethiopian opal is reminiscent of a turtle’s shell.

A euhedral prismatic pargasite crystal is identified in pink spinel.

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

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

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

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

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

A large faceted cuprite is examined at the Carlsbad laboratory.

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

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

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

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

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

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

Fibrous mannardite crystals are observed in three colorless quartz samples.

An aquamarine crystal from Pakistan contains a pseudomorphic quartz inclusion.

Examination of a 1.34 ct ruby reveals a unique inclusion formed during heat treatment.