Ammonite Iridescent

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Iridescent Ammonites are reputed worldwide for their beautiful rainbow-like glow. A special gemstone, ammolite, is formed from fossilised ammonite shells, and also displays this terrific iridescent effect. When the ammonite was alive, nacre was the main component of the shell: after the organism’s death, the shell fossilised over time to form aragonite. The ammolite can also contain many other minerals such as calcite and pyrite. Ammolite is not only rare for its vibrant display of colours, but also for the fact that it is biogenic. Most gemstones are not produced by living creatures. However, ammolite (like amber and pearl, the only other biogenic gemstones in the world), is formed from living organisms: Ammonites.

We do not sell ammolite, but we do sell equally beautiful Iridescent Ammonites, the shells of which form ammolite when the ammonites are from the Alberta, Canada.

Our iridescent ammonites, sourced from Madagascar, include Cleoniceras species displaying a dazzling opalescent effect. Found in the jungles of Mahajanga on the north west coast of Madagascar, these ‘fire ammonites’ are perfect display pieces for your home.


Ammonites are an extinct group of marine invertebrate in the subclass Ammonoidea of the class Cephalopoda. The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams horns. These molluscs are more closely related to living coleoids (i.e. octopus, squid and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest Ammonites appear during the mid Devonian age roughly 350 million years ago, and the last species died out during the Cretaceous-Paleogene extinction event 66 million years ago.

Length: 73mm
Width: 60mm
Height: 20mm
Weight: 100g