Ring with tourmaline and 6 diamonds

Ring with tourmaline and 6 brilliant-cut diamonds totalling. ca. 0.30 ct, ca. WHITE (H)/VS, oval-cut tourmaline, ca. 11.7 x 8.7 mm, iridescent colour: green-bluish, facet edges chipped,14K yellow gold/white gold, 8.5 g, ring size: 55, W: ca. 4.4 - 14 mm, mid-20th century, minor signs of wear.