Black Opal, Diamond, Platinum Ring The ring features an oval-shaped black opal cabochon measuring 13.97 x 11.38 x 6.63 mm and weighing approximately 6.00 carats, enhanced by full and tapered baguette-cut diamonds weighing a total of approximately 1.30 carats, set in platinum. A GIA report # 5202442510, dated July 23, 2020, stating Natural Opal, Black, No Indications of Treatment, accompanies the center stone. Gross weight 10.68 grams. Size: 5-1/2 (sizeable) HID03101062020 © 2020 Heritage Auctions | All Rights Reserved