RING Yellow gold and silver, set with a cushion-cut peridot in a surround of small rose-cut diamonds. Russian work, late 19th century. A 14k gold and silver ring set with a cushion-shaped peridot. Russia, late 19th Century. RC : Russian hallmark "56". TDD: 57; US: 8 (subject to change). Gross weight: 3.6 g (14k - 585 and Agt 925).