925 sterling silver diamond cut overlapping feathers design ring with a gorgeous faceted rectangular solitaire peridot stone. The stone set in the middle measures 3/16 inch wide. It is available in sizes 6, 7, and 8. Peridot is the rare gem-quality variety of the common mineral olivine, which forms deep inside the Earth’s mantle and is brought to the surface by volcanoes. Rarely, peridot is also found inside meteorites. Peridot is the birthstone for August.