March Birthstone

March is one of a handful of birthstone months with genuinely distinct modern and traditional stones: aquamarine as the modern pick, and bloodstone carrying the older, historical claim. The two could hardly look more different — one a clear, pale blue-green, the other a dark, opaque green flecked with red — and both come with their own dedicated folklore rather than sharing a single storyline.

Aquamarine: The Sailor's Stone

Aquamarine is a variety of beryl, the same mineral family as emerald, colored by trace iron rather than the chromium or vanadium responsible for emerald's green. Its name comes directly from the Latin aqua marina, 'water of the sea,' a description that fits the stone's pale, clear blue-green so precisely that little embellishment was needed. That maritime naming wasn't just poetic — aquamarine carried a genuine folk reputation as a protective talisman for sailors, believed to calm rough waters and guard against seasickness and shipwreck, a belief detailed in gem lore going back to ancient Rome. It rates 7.5 to 8 on the Mohs hardness scale, making it a durable, everyday-wearable stone, and it's typically found with far fewer visible inclusions than emerald, since aquamarine's crystal structure tends to grow with less internal stress than its green beryl cousin.

Bloodstone: The Martyr's Stone

Bloodstone, also known by the older name heliotrope, is a form of chalcedony (a variety of quartz) — typically a dark, opaque green base scattered with small red or reddish-brown spots of iron oxide, which give the stone its name. Christian legend from the medieval period held that bloodstone formed at the foot of the cross during the crucifixion, when drops of blood fell onto green jasper at the ground and stained it permanently — a story that gave the stone a specific devotional significance in medieval Europe, where it was sometimes carved into religious scenes and used for signet rings and seals. It rates 6.5 to 7 on the Mohs scale, slightly softer than aquamarine but still durable enough for regular jewelry use.

Two Very Different Stones, One Month

The pairing of aquamarine and bloodstone under a single birth month is a useful reminder that birthstone lists were assembled and revised over time — often for commercial and cultural reasons as much as any consistent underlying logic — rather than derived from a single ancient source. Aquamarine's association with March is comparatively recent by gem-history standards, gaining prominence as beryl mining expanded and clear blue-green stones became more available and fashionable in the 20th century, while bloodstone's connection to the month traces back centuries further through its religious symbolism.

Care Notes

Both stones handle regular wear well. Aquamarine, at 7.5–8 on the Mohs scale, is one of the more durable colored gems and tolerates ultrasonic cleaning in most cases, though as always a jeweler should confirm the specific stone hasn't been treated in a way that changes that recommendation. Bloodstone, being opaque and slightly softer, is generally better suited to warm soapy water and a soft cloth rather than ultrasonic or steam cleaning, which can be harsher on porous or fractured material.

Famous Aquamarine and the World's Largest Gem Beryls

Aquamarine has produced some of the largest colored gemstones ever cut from a single crystal, a byproduct of the way beryl tends to grow in large, relatively clean hexagonal columns compared to most other gem minerals. The Dom Pedro aquamarine, mined in Brazil and carved by German lapidary Bernd Munsteiner, stands roughly 14 inches tall and is considered the largest cut aquamarine in the world, now housed in the Smithsonian's National Museum of Natural History. Brazil has also historically produced individual rough aquamarine crystals weighing well over 100 pounds, dwarfing anything comparable in most other colored-gem categories — a genuine consequence of beryl's crystal habit rather than aquamarine specifically being unusually abundant underground.

Heliotrope, Renaissance Carving, and a Persistent Older Name

Bloodstone's older name, heliotrope, comes from the Greek helios (sun) and tropos (turning), a reference to an ancient belief — recorded by the Roman naturalist Pliny the Elder — that the stone, when placed in water, could turn the reflection of the sun blood-red, or in some tellings could be used to view solar eclipses safely. That specific optical claim doesn't hold up to modern testing, but the name stuck regardless, and heliotrope remains the term still used in some European jewelry markets today alongside 'bloodstone.' The stone was a favored material for Renaissance carvers producing devotional cameos and intaglios specifically because its natural red flecks could be strategically positioned by a skilled cutter to represent wounds or blood in religious scenes, most famously in depictions of the crucifixion itself — a rare case of a gemstone's natural pattern being deliberately incorporated into figurative religious art rather than simply polished for color alone.

Where Modern Aquamarine and Bloodstone Come From

Brazil remains the dominant source of fine aquamarine today, with Nigeria, Madagascar, and Zambia contributing increasing volumes of gem-quality material in recent decades. Bloodstone is mined in a more limited set of locations, with India historically supplying much of the material used in Western jewelry and carving, alongside smaller deposits in Australia, Brazil, and the United States.

Heat Treatment and Color in Aquamarine

Much of the aquamarine sold commercially has been heat-treated to improve its color — rough beryl crystals destined to become aquamarine often show a greenish tint from iron in a different oxidation state, and controlled heating (typically a few hundred degrees) shifts that iron to the state responsible for aquamarine's characteristic pure blue, removing the greenish cast in the process. This treatment is stable, permanent, and disclosed as standard trade practice, distinguishing it from more invasive treatments like emerald's oil-filling, since heated aquamarine requires no special care beyond what any untreated aquamarine would need.

Bloodstone's Role in Signet Rings and Family Seals

Because bloodstone takes an engraved detail well and was historically valued for its durability and distinctive appearance, it became a favored material for signet rings used to stamp wax seals on official documents and correspondence, a practical use spanning from ancient Rome through the European medieval and Renaissance periods. Family crests and heraldic designs carved into bloodstone signets were sometimes passed down as heirlooms across generations, giving certain surviving pieces documented ownership histories stretching back centuries — a use case bloodstone shares with several other historically favored 'seal stones' including sardonyx and carnelian, all valued for a similar combination of moderate hardness, fine-grained structure, and an ability to hold crisp engraved detail.

Choosing Between the Two March Birthstones Today

For anyone selecting a March birthstone piece today, the practical choice between aquamarine and bloodstone often comes down to look and price point rather than any strict rule about which is more 'correct': aquamarine offers a clear, pale blue-green that pairs easily with a wide range of metal tones and other gems, while bloodstone's opaque, textured green-and-red appearance reads as more rustic and historically grounded, a favorite in signet rings, cufflinks, and men's jewelry specifically because of that carved-seal heritage described above.