Ring in yellow gold 750 thousandths and platinum 850 thousandths, centered on a round-cut sapphire approx. 0.50 ct (minor chips) in a surround of twelve rose-cut diamonds. Early 20th century. Sapphire size: 5.6 - 5.7 x 2.8 mm Total estimated diamond weight: 0.20 ct Finger: 54 - Gross weight: 4 g