July 23 – August 22 · Fire

Leo birthstones

Leo carries Peridot and Onyx in the zodiac tradition.

Peridot

Composition Magnesium iron silicate ((Mg,Fe)₂SiO₄) — gem-quality olivine
Hardness · System 6.5–7 · Orthorhombic

Peridot arrives on Earth in meteorites — pallasite meteorites carry gem-quality crystals formed beyond this planet.

Traditionally linked to lightness, release of resentment and fresh perspective.

Onyx

Composition Banded chalcedony
Hardness · System 6.5–7 · Trigonal

Most solid black onyx is dyed grey chalcedony. Naturally uniform black onyx is scarce.

Traditionally linked to discipline, endurance and holding a boundary.

Sign or month?

Leo runs July 23 – August 22, 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 →

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