Ring with sapphire, ruby, emerald and 3 diamonds

Ring with sapphire, ruby, emerald and 3 brilliant-cut diamonds totalling ca. 0.06 ct, ca. WHITE (H)/VS-SI, sapphire, ruby ​​and emerald in pear-cut, 18K yellow gold, 11.4 g, ring size: 54, W: ca. 7.5 - 19.6 mm, late 20th century, minor signs of wear, with hallmark.