Peridot, the assigned stone for the summer month of August, is ancient but still very popular gemstone. Slightly golden shimmering green variety of it is ideal gemstone color to complement a light summertime outfit. It is formed of olivine, silicate found in igneous rocks, and a very good constituent of Earth's upper mantle. The gemstone is in fact called by three names, Peridot, Chrysolith and Olivin. Peridot is derived from Greek word "Peridona," which mean "giving plenty." The word "Chrysolith" means "goldstone" in Greek. It is one of the few stone that...