Peridot is the term used to describe gem-quality olivine. Olivine is a somewhat abundant mineral but gem-quality peridot is rather rare. Peridot is one of the only gems that is found in only one color, usually an olive green. The color of peridot is determined by the iron content of the gem and the highest valued peridot usually is distinguished by a dark green color. Peridot is also one of the only gemstones found in meteorites. The United States is currently one of the biggest suppliers of peridot with much of its deposits found in Arizona. Peridot jewelry can be worn to symbolize the birth month of August. It is believed that this gemstone brings the wearer success, peace, and goodluck.