Shop Opal Butterfly Necklace Sterling Silver. Unique butterfly necklace minimalism style, perfect necklace for women girls to wear. It will add a splash of bright blue with a touch of bluecolor to your casual dress. It made from: - Diamond cut sterling silver chain - Blue opal butterfly charm- lab created 18mm x 11mm for butterfly pendant - Sterling silver lobster clasp Please select desired length from the drop-down menu. If you like to have it adjustable - just drop a note in 'Message to a seller' . Dainty opal necklace will make a great gift for daughter, graduation gift. Opal is October birthstone. Your order of opal jewelry will be mailed within 2 business days, nicely packed and ready to be given. All US orders and most international orders will have a tracking#.