Water sprite-Opal. Opal is a transliteration of English opal, which comes from Latin Opalus, meaning "combining the beauty of gems". Its most famous origin is "Lightning Ridge" in Australia, so it is also called "Flash Mountain Cloud" or "Flash Rock". Opal belongs to opal mineral, and only precious opal can be called opal. High-quality opal is as bright as a rainbow after rain, and all kinds of magical brilliance and gorgeous colors will appear when it rotates, which is dazzling. In Europe, opal is regarded as the representative of luck, symbolizing hope, purity and happiness. The ancient Romans called it "Cupid's handsome man" and even thought that "opals are as valuable as diamonds". Because opal is colorful and charming. It gives people wonderful and endless imagination, so it is known as the "stone of hope". This is the birthstone of October.