March Birthstones

March is a genuine case of the modern and traditional lists pointing at two visually opposite stones — pale sea-blue aquamarine versus dark, near-black bloodstone flecked with red — and the divergence tells a real story about how the 1912 list was built, rather than being an arbitrary quirk.

Bloodstone (also called heliotrope) is a dark green form of chalcedony scattered with red jasper inclusions that resemble drops of blood. Medieval Christian legend held that the red spots formed from Christ's blood staining green jasper at the foot of the cross during the crucifixion, which is why bloodstone became closely tied to Lent and Easter — both of which usually fall within or near March. That religious calendar connection, not any astrological reasoning, is almost certainly why bloodstone became March's traditional stone in the first place.

Aquamarine, by contrast, is a pale blue-to-teal variety of beryl (the same mineral family as emerald), colored by trace iron rather than the chromium/vanadium that colors emerald green. Its name comes directly from the Latin for "seawater," and it built a strong association with sailors, who carried it as a protective talisman for safe ocean crossings — a folk tradition documented at least as far back as ancient Rome.

When the 1912 list was compiled, aquamarine was chosen for March likely because it was more commercially viable as a faceted gemstone — it forms in large, clean, transparent crystals well suited to cutting, where bloodstone's opacity limits it mostly to cabochons and carved pieces. That's a pattern worth knowing: several of the differences between "modern" and "traditional" birthstones in this era came down to what the jewelry trade could actually sell profitably, not a rejection of the older folklore.

March spans the last days of Pisces and the first three weeks of Aries — a genuine seasonal hinge point (the spring equinox falls within the month), which may be part of why two such different stones both attached themselves to it: one tied to the religious calendar, one to the turning of the season and safe travel as winter ends.

Bloodstone remains widely available and inexpensive as a durable, opaque stone (Mohs 6.5–7) well suited to carved cabochons and men's jewelry in particular, where its dark, mottled surface reads differently from most other birthstones on this list.

Both stones have their full geological profiles on their own crystal pages; this page exists specifically to explain why March, unusually among the twelve months, never fully resolved into a single agreed-upon stone.

A naming detail worth clarifying: bloodstone is genuinely a variety of chalcedony, not jasper, even though it's occasionally sold under the colloquial label "blood jasper." Jasper is itself a separate, more opaque chalcedony variety usually colored by iron oxide throughout rather than by scattered inclusions, so the two names aren't strictly interchangeable, even though both are chalcedony at the mineral-family level.

The finest aquamarine historically came from Brazil's Minas Gerais region, but Madagascar and Nigeria have both become significant modern sources, occasionally producing exceptionally large, clean crystals — one Brazilian specimen found in 1910, the Dom Pedro obelisk, was eventually cut into the largest faceted aquamarine in the world at over 10,000 carats, now held in the Smithsonian.

Nearly all aquamarine on the market today is heat-treated to remove a slight greenish or yellowish tint and produce the purer sky-blue color most buyers expect, a stable, permanent, and industry-standard treatment rather than anything requiring special disclosure beyond normal trade practice.