Astteria, Diamond, Ring, Sapphire 11.70 Ct. (13.49 Ct.TW) GRS Certified Unheated Natural Vivid Blue Madagascar Sapphire and Diamond Ring August 8, 2023 sensualsapphires 11.70 Ct. (13.49 Ct.TW) GRS Certified Unheated Natural Vivid Blue Madagascar Sapphire and Diamond Ring at Astteria Jewelry