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Ammonite Fossil Pendants in Sterling Silver  

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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Ancient Marine Fossils Set in .925 Sterling Silver

Ammonites were marine mollusks related to modern nautilus, squid, and octopus. They thrived in Earth's oceans for over 300 million years before extinction alongside the dinosaurs. The fossilization process transforms original shell material through mineral replacement, creating the distinctive patterns and colors found in each specimen. Madagascar produces many of the ammonite fossils used in jewelry, where geological conditions preserved exceptional detail in the chambered spiral structure. These fossils register between 4 and 7 on the Mohs hardness scale depending on mineral composition. Calcite-replaced specimens sit at the softer end, while those with pyrite or silica content prove more durable for daily wear. The iridescent variety, known as ammolite, comes primarily from Alberta, Canada and displays color play similar to opal. Sterling silver settings protect fossil edges while allowing full visibility of natural spiral formations and surface patterns. Our inventory spans small everyday pendants to large statement pieces featuring rare specimens with visible suture patterns or unusual mineralization. Each fossil formed on an ancient seafloor, making every pendant a fragment of geological history now available for personal wear.
How old are ammonite fossils in jewelry?

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.

Are ammonite fossil pendants durable enough for regular wear?

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.

What creates the different colors in ammonite fossils?

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.

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