March 21 – April 19 · Fire

Aries birthstones

Aries carries Diamond and Bloodstone in the zodiac tradition.

Diamond

Composition Pure carbon (C) in cubic crystal structure
Hardness · System 10 · Cubic

The hardest natural substance — but hardness is not toughness. A diamond will scratch anything, and still cleave if struck along its grain.

Traditionally associated with clarity, permanence and commitment.

Bloodstone

Composition Chalcedony (cryptocrystalline quartz) with inclusions of red iron oxide
Hardness · System 6.5–7 · Trigonal

The red spots are iron oxide, not blood — but the resemblance drove nearly all of its folklore.

Traditionally carried for courage and endurance, particularly by athletes and soldiers.

Sign or month?

Aries runs March 21 – April 19, 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