JONC RING White gold, set with an oval sapphire weighing approximately 2.15 ct, the shoulder set with a drop of brilliant-cut diamonds. TDD: 55; US: 7 1/2 (not subject to change). A diamond and 18k gold ring, set with an oval cut sapphire weighing approximately 2.15 ct. RC : Gross weight: 13.7 g (18k - 750).