Beautiful October birthstone jewelry for girls she will love. Opal and tourmaline is the traditional birthstone for the month of October. Opal is the national gemstone of Australia - and for good reason - almost 98% of all opals come from Australia. Other opal sources include the United States and Mexico. Opals are loved for their play of color or rainbow fire within. Twirl an opal and you'll be amazed by the variety of brilliant colors being displayed before you. Tourmaline is mainly mined in Brazil and Africa. Tourmaline - although a beautiful gem - is often highly included and should be handled with care. Pink tourmaline remains a customer favorite.