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Peridot is the magnesium-rich, gem quality version of a mineral named olivine. Olivine and peridot are made in Earth's upper mantle, which starts between 7km to 35km deep and ends around 410km deep. This means, peridot is found in lava rock, which carried the peridot from below the crust to the surface. Peridot is also found in rare meteorites called pallasites, and these peridots have a different chemical composition.
These sterling silver studs are 4mm in diameter.