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The iridescent green stones in these earrings are actually pieces of fossil ammonites, a relative of the nautilus. The stone takes its name from the animal, and is called ammolite.
The ammonites that form ammolite inhabited a prehistoric, inland subtropical sea named the Western Interior Seaway, which ran North to South along the Rocky Mountains. After the ammonites died, they were buried in mud that eventually became shale, which helped preserve the aragonite of the shells, preventing it from converting to calcite.
The stones in these sterling silver earrings are triplets, and have dark backs to support the iridescent fossils and clear quartz tops to protect them.