Browse online to see our wide selection of October birthstone jewelry. You'll find opal necklaces, earrings, bracelets, and more. Opal and Tourmaline are October's various birthstone gemstones. Investigate the style of the October birthstones at Orchid Jewelry UK and let us help. For those conceived in the long stretch of October, Opal is your birthstone! It is a semi-valuable gemstone.