The beautiful Opal is October's birthstone. Over 500 years ago the Aztecs mined opals in Central America and they were discovered in Australia in the 1880's. There are many types of opals such as white opal, black opal, fire opal and boulder opal.
Ancient Romans considered the opal to be a symbol of power and Europeans in the 14th century thought it was an unlucky stone. I think it's an amazingly beautiful stone!