Centering a prong set, Round Brilliant cut diamond; measuring 6.66 x 6.74 x 3.66mm; weighing approx 1.04ct (E color, IF clarity). Scalloped open gallery. Fashioned in platinum and 18k yellow gold. Stamped “TIFFANY & Co”. Circa 1920. GIA# 2155537261. Size 5.75.