Ammolite

Ammolite is one of the few organic gemstones — like pearl and amber, it comes from living things rather than crystallized minerals. Specifically, it is the fossilized, color-play shell of ammonites, sea creatures that died out with the dinosaurs. Over seventy million years the shell’s aragonite took on a structural iridescence that flashes red, green, gold, and blue, much like opal or labradorite. It was only recognized as a gem in 1981.

It is found in gem quality essentially one place on earth: the Bearpaw Formation along the St. Mary River in Alberta, Canada. Because the natural shell layer is thin and soft (Mohs ~3.5–4.5), ammolite is almost always sold as a doublet (backed for support) or triplet (backed and capped with a protective dome of quartz or spinel) — the cap is what makes it wearable.

Color

Doublets, triplets & treatment

Most ammolite is stabilized and assembled: a thin natural color layer bonded to a backing, often with a clear protective cap. This is standard and disclosed — it is what lets a Mohs-4 organic material be set and worn. Solid natural ammolite exists but is fragile and reserved for collectors.

Daily wear

Ammolite is a soft, assembled gem — treat it gently. It is ideal in pendants and earrings; in a ring, only in a fully protective bezel and with the understanding that it cannot take abrasion. Keep it away from water immersion, ultrasonic cleaners, steam, heat, and chemicals; wipe with a soft damp cloth. Worn thoughtfully, it is unlike anything else in the case.