Peridot is sometimes called chrysolith, from the Greek for “gold stone,” although technically, Peridot is not gold but a brilliant, unique green. Peridot is an idiochromatic gem: unlike many other gems, its color comes from its pure chemical makeup (mainly iron), and not from any impurities in the stone. This is why Peridot is only found in golden shades of green (and, conversely, why many other stones are available in a range of hues). The volcanic island Zabargad in the Red Sea off Egypt was once the largest source of Peridot mining, but today, mines can be found in the southwest US, China, Vietnam and Pakistan—the latter now producing the world’s finest Peridot. Typically, a stone with a deep green hue is considered the highest quality. Peridot is August’s verdant, summery birthstone.