Congratulations! You have found a Peridot Gemstone! Pronounced \ˈper-ə-ˌdät, -ˌdō(t)\ - Peridot is an olive green gemstone and one of the few that occur only in one color. The hue may vary from yellow to olive to brownish green depending on the amount of iron in the gem. It is the birthstone of August. Peridot is a type of Olivine, which is an abundant mineral, but gem quality peridot is rare. Its occurrence is mostly found throughout the United States, Australia, and Saudi Arabia. Peridot is found in lavas and meteorites.