The professional gemstone encyclopedia

The chameleon gem — green in daylight, red under incandescent light.

The most popular purple gemstone — once valued alongside diamonds.

The sea-blue beryl — elegant, eye-clean, and universally flattering.

A family of gems spanning every color — not just the deep reds.

The pink beryl that became the alternative engagement ring stone.

Nature's kaleidoscope — a play of spectral fire locked in hydrated silica.

The extraterrestrial gem — found in meteorites and volcanic basalt.

The great imposter — historically mistaken for ruby and sapphire, now prized in its own right.

Found in only one place on earth — a violet-blue stone rarer than diamond.

From imperial orange to electric blue — a versatile and durable gem.

The rainbow gem — no other mineral occurs in as many colors.