MAN'S SIGNET RING In platinum, set with an oval cut ruby weighing approximately 4 cts in a double octagonal setting of tapered diamonds and calibrated emeralds. A diamond, emerald and platinum ring set with an oval cut ruby weighing approximately 4 cts. RC : Stone dimensions: approximately 11.8 x 9.5 x 3.3 mm. TDD: 57.5; US: 8.1/4 (changeable). Gross weight: 22.8 g (Pt - 950).