Physical Properties of Peridot Peridot is the gemstone variety of the mineral olivine and a popular stone for jewelry, due to its beautiful olive-green color. Non gemstone varieties of olivine have been found in reddish or brownish shades as well, but the name “peridot” has come to be associated with only the gemstone grade olive-green specimens. The more yellowish the stone, the lesser it’s perceived value. It is of good hardness, with a score of 6.5-7 on the Mohs scale, which is similar to that of quartz. It is the traditional birthstone for the month of August.
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