Peridot is one of the few gemstones that occur in only one color, an olive green. The intensity and tint of the green, however, depends on how much iron is contained in the crystal structure, so the color of individual peridot gems can vary from yellow- to olive- to brownish-green. The most valued color is a dark olive-green.
It is sometimes mistaken for emeralds and other green gems.Peridot olivine is mined in Egypt, North Carolina, Arizona on the San Carlos Reservation, Hawaii, Nevada, and New Mexico at Kilbourne Hole, in the US; and in Australia, Brazil, China, Kenya, Mexico, Myanmar (Burma), Norway, Pakistan, Saudi Arabia, South Africa, Sri Lanka, and Tanzania. High quality peridot was also recovered from anthills and in lamproite in the Leucite Hills of Wyoming. While searching for diamonds in the Leucite Hills, Dan Hausel recovered 13,000 carats of peridot from two anthills located near the Black Rock lamproite.