An 18ct yellow gold and diamond three stone ring, set with old-cut diamonds, the centre stone approx

An 18ct yellow gold and diamond three stone ring, set with old-cut diamonds, the centre stone approx 1ct flanked by two diamonds approx 0.5ct each, estimated total diamond weight approx 2cts, ring size O1/2, total gross weight approx 2.7g
Good condition, wear commensurate with age