Peridot is the birthstone for August and 16th anniversary gemstone. The August birthstone of the Peridot is considered to be the birthstone for Leo (The sign of the Lion) and relate to those born between July 23 - August 22. The Zodiac sign of Leo also responds to Onyx, Diamond, Carnelian, Sardonyx and Ruby. Peridot is perhaps derived from the French word peritot which means unclear, probably due to the inclusions and cloudy nature of large stones. It could also be named from the Arabic word ......