An 18 Karat Yellow Gold, Platinum, Black Opal, Diamond and Cuprian Tourmaline Pendant, containing one modified drop shape black opal from Lightning Ridge, Australia weighing approximately 23.25 carats within a gold surround accented with 12 cuprian elbaite (Paraiba-type) tourmaline weighing approximately 0.60 carat total and numerous round brilliant cut diamonds weighing approximately 0.15 carat total.Stamp: DG 18K PLAT.