These are beautiful inlaid Australian Opal Sterling Silver earrings that measure 19x7 MM and weighs 4.7 grams. The opals on these earrings are inlaid into the sterling silver and originate in Australia. The backs on these earrings are solid sterling silver butterfly backs. Opals are known for purifying blood, building immunity to help fight off fevers and infections, as well as boosting memory power. Opal is the gemstone associated with the month of October.