Opal, and its dramatic play of color has inspired writers to match it to fireworks, galaxies, and volcanoes. Nomadic Bedouins once believed opal held lightning and fell from the sky during thunderstorms. The Ancient Greeks thought opals bestowed the gift of prophecy and protection from disease. Europeans long maintained opal to be symbolic of purity, hope, and truth. Years ago, opal was once believed to embody the virtues and powers of all the colored stones.