S.s necklace with ammonite pendant

Ammonites are fossils of cephalopods that died out with the dinosaurs. Ammonites were the most prominent during the Cretaceous and Jurassic eras disappearing 66 million years ago. They are related to modern squid and nautilus.
This Ammonite fossil is a slice in half showing the inside crystalization.
This would need to be worn with mindfulness of care to help the fossil last longer. Don’t swim or shower in it. Don’t toss it down hard onto a dresser. If you take care it should last a long time

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