Vintage diamond three stone ring. Set with a round old cut in an open back claw setting with a weight of 0.70 and two round old cut diamonds in similar settings with a combined weight of 0.90 carats. The total approximate diamond weight is 1.60 carats, to a three stone design with a decorative pierced gallery, circular backholing and inwardly tapering shoulders featuring cheniers and continuing down to a solid D-shape shank. Marked 18 carat white gold, numbered '150', maker's mark 'M.B.S.', English, circa 1950.