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Peridot is the gem variety of the mineral Olivine, which forms under intense volcanic heat and pressure deep below the Earth's crust. It receives it's grassy green color from the presence of iron and magnesium. Small crystals are abundant, but larger crystals are exceedingly uncommon.
The first use of Peridot likely occurred on the island of Zabargad in the Red Sea some 3,500 years ago. Faceted stones from this location have been found in the ruins of Ancient Greece and extensively in Egypt, indicating its historic value as a personal object of beauty
