Shop Moon Phase Necklace. You can wear this opal necklace with any style/color of your dress. This layering necklace is made from: - Lab created white opal moon bead- 11 mm x 8 mm - Diamond cut sparkling sterling silver chain - Sterling silver lobster clasp - Sterling silver jump ring Please select a desired length from the drop-down menu. Opal jewelry will make a great birthday gift! Opal is October birthstone. Your order of celestial jewelry will be mailed within 2 business days, nicely packaged ready to be given. US orders and most international orders will have a tracking#.