Ring with oval faceted tanzanite,

Ring with oval faceted tanzanite, ap. 8 x 6 mm, surrounded from 20 brilliant cut diamonds, totalling ap. 0.06 ct, 12 trapezoidal cut diamonds, totalling ap. 0.08 ct, 18K white gold, 4.1 g, ring size 56. 20th/21st century, minimal signs of wear.