RING In white gold, set with a brilliant-cut diamond weighing approximately 1.50 ct, outlined and shouldered with small diamonds. A diamond and 18k gold ring set with a brilliant cut diamond weighing approximately 1.50 ct. RC : Estimated colour: G-H Estimated purity: SI1 TDD: 54; US: 7 (changeable). Gross weight: 5.2 g (18k - 750).