RING In white gold, set with a beautiful rectangular shaped emerald weighing 6.31 cts, in a beautiful surround of marquise-cut and round diamonds. A diamond and 18k gold ring set with a rectangular shaped emerald weighing 6.31 cts. C.G.L. certificate stating: origin Colombia, impregnated with minor oil. RC : Dimensions of the stone: 11.57 x 10.30 x 7.15 mm. TDD: 57 - 58; US: 8 (can be changed, internal ring) Gross weight: 7.2 g (18k - 750).