CHEVALIERE In white gold, set with a cushion-shaped sapphire weighing 9.85 cts, the corbeille and shoulder entirely paved with brilliant-cut diamonds. A diamond and 18k gold ring set with a cushion-shaped sapphire weighing 9.85 cts. N.G.J.A certificate attesting: natural sapphire (natural corundum). RC : Stone dimensions: 11.30 x 11.08 x 8.67 mm. TDD: 62; US: 10 (subject to change). Gross weight: 20.4 g (18k - 750).