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The iridescent green stones in these earrings are actually parts 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 doublets, and have a dark substrate to support the iridescent fossils.