Bloodstone — known in classical antiquity and medieval lapidary literature as heliotrope — is a dark green chalcedony characterised by vivid red to brownish-red spots or streaks of iron oxide, principally haematite. As one of the two recognised birthstones for March, alongside the more fashionable aquamarine, bloodstone holds the older and more historically documented claim to the month, appearing on traditional birthstone lists — including those endorsed by the British National Association of Goldsmiths (NAG) — and traceable in association with March through at least the fifteenth century. Its hardness of 6.5 to 7 on the Mohs scale, combined with its opacity and relatively modest cost, has made it a practical and enduring choice for set jewellery across many centuries.

Mineralogy and Appearance

Bloodstone belongs to the chalcedony branch of the quartz family (silicon dioxide, SiO₂), and is more precisely classified as a variety of jasper — a term applied to opaque, microcrystalline quartz with significant mineral inclusions. The characteristic green body colour arises from dispersed chlorite or hornblende inclusions, while the distinctive red markings result from patches of iron oxide, most commonly haematite. The distribution of these red spots is entirely natural and varies considerably from stone to stone: some specimens display discrete, well-separated dots; others show irregular blotches or even vein-like streaks. No two bloodstones are identical in their patterning, which has historically lent each stone a degree of individuality prized by collectors and signet-ring engravers alike.

The name heliotrope derives from the Greek helios (sun) and trepein (to turn), a reference to an ancient belief — recorded by Pliny the Elder — that the stone, when placed in water, caused the reflected image of the sun to appear blood-red. While this optical phenomenon is not reproducible under modern scrutiny, the name persisted in scientific and lapidary literature well into the nineteenth century and remains in use among gemmologists today.

Historical and Cultural Significance

Few gemstones carry as long a documented history of symbolic association as bloodstone. Medieval Christian tradition held that the red spots represented the blood of Christ fallen upon a green jasper at the Crucifixion, a legend that elevated the stone to considerable devotional importance throughout Europe. Carved bloodstone seals, amulets, and devotional objects from the medieval period survive in museum collections across Britain and the Continent. The stone was also widely believed to possess apotropaic and medicinal properties — staunching bleeding, conferring courage, and conferring invisibility upon its bearer — beliefs recorded in lapidaries from the twelfth century onwards.

In the signet tradition, bloodstone was a preferred material for intaglio engraving from antiquity through the Victorian era. Its fine, even texture and opacity make it well-suited to the cutter's tool, and many important heraldic seals were executed in bloodstone. The British royal family's use of bloodstone seals is well documented, and the stone appears frequently in Georgian and Victorian mourning jewellery as well as in gentleman's fob seals.

Principal Sources

The most historically significant deposits of bloodstone are found in India, particularly in the Kathiawar Peninsula of Gujarat, which has supplied material to European and Asian markets for centuries. Additional sources include Australia, Brazil, China, and the western United States. Indian material is generally considered the finest, displaying a saturated, deep green ground with well-defined, bright red spots. The stone is not rare in the commercial sense — substantial quantities reach the market annually — and this accessibility has historically reinforced its role as a democratic and widely wearable birthstone.

Bloodstone in Jewellery

Because bloodstone is opaque, it is almost universally fashioned as a cabochon rather than a faceted stone. Oval and round cabochons dominate the market, though cushion and rectangular forms are common in signet rings and seal stones. The material is also carved into cameos, intaglios, and decorative objects. Settings in sterling silver are the most prevalent in contemporary jewellery, though antique and estate pieces frequently appear in yellow gold, particularly in the heavy, substantial mounts characteristic of Victorian and Edwardian craftsmanship.

Bloodstone is not routinely treated. Unlike many coloured gemstones, it requires no heat treatment, irradiation, or fracture filling to achieve its characteristic appearance; the colour and patterning are entirely natural. This absence of treatment is a point of distinction that appeals to buyers who value gemstone integrity.

Care and Durability

With a Mohs hardness of 6.5 to 7 and no cleavage, bloodstone is reasonably durable for everyday wear, though it will scratch if brought into contact with harder materials such as topaz, corundum, or diamond. Cleaning with warm water and a mild soap, applied with a soft brush, is entirely safe. Ultrasonic and steam cleaners are generally acceptable for untreated material, though caution is advisable if any surface fractures are present. Prolonged exposure to harsh chemicals should be avoided, as with most porous or microcrystalline gem materials.

Birthstone Status

The modern standardised birthstone list, as revised by the American Gem Trade Association (AGTA) and the Jewelers of America in 1912 and subsequently updated, designates aquamarine as the primary birthstone for March, with bloodstone retained as a recognised alternate. The British NAG list, which has historically been more conservative in its revisions, continues to list bloodstone prominently for March, reflecting the stone's deep roots in British jewellery tradition. For those who prefer a birthstone with historical depth, symbolic richness, and an unbroken association with March stretching back many centuries, bloodstone presents a compelling and well-documented alternative to aquamarine.

Further Reading

• GIA: March Birthstones — Aquamarine and Bloodstone
• AGTA: Birthstone Guide
• IGS: Bloodstone Gem Information