Ring with fine Tahitian pearl and diamonds of total approx. 0,67 ct (hallmarked),

Ring with fine Tahitian cultured pearl 13 mm, with beautiful lustre and brilliant-cut diamonds totalling ca. 0.67 ct (marked), ca. RW-WHITE (G-H)/VS-SI, solid ring shank made of 18K yellow gold, 19.4 g, ring size 54, 21st century, good condition, unknown maker's mark.