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Peridot is one of the few gemstones that comes in a single color. The depth of green depends on its level of iron content. Peridot's color can vary from yellow-green and olive to brownish green and looks best under natural daylight. Its vivid green color does not change under artificial light. The best-colored peridot has an iron percentage of less than 15% and typically includes some trace elements of nickel and chromium, which contribute to its color. A deep and intense green colored peridot is considered the most desirable and the most valuable.Peridot occurs with excellent transparency. Eye-clean specimens are abundant. Larger stones may appear slightly cloudy owing to the presence of inclusions and impurities. When cut and polished, peridot has an attractive, greasy and vitreous luster.