January 20 – February 18 · Air

Aquarius birthstones

Aquarius carries Amethyst and Garnet in the zodiac tradition.

Amethyst

Composition Silicon dioxide (SiO₂) — quartz coloured by iron and natural irradiation
Hardness · System 7 · Trigonal

Amethyst fades in sunlight. Heat it and it turns yellow — most commercial citrine is heat-treated amethyst.

Traditionally associated with clear thinking, restraint and calm; the classic stone of sobriety.

Garnet

Composition Group of silicate minerals — almandine, pyrope, spessartine and others
Hardness · System 6.5–7.5 · Cubic

Garnet is not one mineral but a family. Almandine gives the familiar deep red; tsavorite garnet is green and rarer than emerald.

Traditionally carried by travellers as a stone of safe return, and long associated with vitality and steady energy.

Sign or month?

Aquarius runs January 20 – February 18, which crosses two calendar months — so the zodiac stone and the monthly birthstone may or may not agree depending on your exact date. Neither system overrules the other; the zodiac one is simply older.

Compare against the monthly chart →

← All zodiac birthstones