Ring with tourmaline and 3 brilliant-cut and octagonal-cut diamonds

Ring with tourmaline and 3 diamonds in 1 brilliant and 2 single-cut totalling ca. 0.06 ct, and 3 cubic zirconia, emerald-cut tourmaline ca. 7.5 ct, 14K white gold, 6.7 g, ring size: 55, W: approx. 2.8 - 16 mm, 20./21. century, minor signs of wear, with hallmark.