Opal Pendant Necklace in 14K Gold Filled. October Birthstone Necklace. This necklace features a mesmerizing laboratory-created white opal. You won't want to take your eyes off the iridescent flashes of blue, pink, and yellow! The gem measures 10X8mm, and the setting, chain, and all findings are 14Kt gold-filled. A sparkling necklace that goes with everything and is sure to become one of your favorite pieces. This necklace is also available in sterling silver…