CHRISTIAN BAUER ring with amethyst,

CHRISTIAN BAUER Ring with amthyst, rectangular faceted, ca. 8.3 x 6.3 mm, edges minimal chipped, surrounded by 12 brilliant cut diamonds, totalling 0.81 ct (marked), WHITE (H)/VS, 18K yellow and white gold, 13.8 g, ring size 56, 2nd half of 20th century, minimal signs of wear, with hallmarked.