How perfect that just as everything is starting to bloom and green up the May birthdays get to celebrate with vivid green gemstone jewelry. Both the modern and traditional birthstone for May, the emerald, is a symbol of rebirth, is believed to grant the owner youth, foresight, and good fortune. Agate is the historical birthstone for May. In Britain, Chrysoprase is also a May Birthstone. See more at May's Emerald Jewelry And Other Surprising Options.