Ammonite fossil pendants bring prehistoric ocean life into modern jewelry form. These spiral-shaped cephalopod fossils date back 66 to 400 million years, preserved in mineral-rich sediment that replaced original shell material with calcite, pyrite, or ammolite. Each pendant features a genuine ammonite specimen set in .925 sterling silver. Our collection includes 28,529 pieces ranging from $16 to $11,402, with free shipping to all US addresses. SilverRush Style has specialized in natural stone jewelry since 2005.
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Most ammonite fossils used in pendants range from 66 million to 400 million years old. The exact age depends on the geological formation where the specimen was found. Madagascar specimens typically date to the Cretaceous period, around 66 to 145 million years ago.
Ammonite fossils have a Mohs hardness between 4 and 7 depending on their mineral composition. Sterling silver bezels protect the edges of the fossil. With reasonable care, these pendants hold up well to regular wear, though direct impacts should be avoided.
Colors result from the minerals that replaced original shell material during fossilization. Iron produces reds and browns, pyrite creates metallic gold tones, and aragonite layers in ammolite specimens generate iridescent rainbow colors through light interference.