Pleochroic colors caused by cyclic twinning produce a kaleidoscope effect in alexandrite.

A 2.88 ct Colombian emerald plays host to a metallic yellow pyrite crystal.

Sail-shaped etch features provide proof that a sample sold as aquamarine is actually a spodumene crystal.

Zircon, monazite, and apatite inclusions surrounded by yellow halos are observed in an iolite cabochon.

Numerous two-phase inclusions form a cross in a rock crystal pendant.

An inclusion with a metallic luster is observed in a pinkish orange padparadscha sapphire.

A Fancy Light gray diamond hosts numerous metal sulfide crystals.

The Alumni Collective celebrates GIA alums from all over the world.

This document provides the publication information for Gems & Gemology