The distinctive yellow-green of peridot is sometimes referred to as the evening emerald. The Ancient Egyptians called it "the gem of the sun". We just call it beautiful. In addition to being August's birthstone, peridot is also the traditional 15th wedding anniversary gift. Interestingly enough, it is the only gemstone to be found in comet dust. Peridot has a history of bringing strength to the wearer. You can read more about peridot, here.