Diamond cocktail ring. Set with thirteen round brilliant cut diamonds in open back grain settings with a combined approximate weight of 0.50 carats, further set with twenty six rectangular baguette cut diamonds in open back rubover settings with a combined weight of 1.20 carats, flanked by thirty four round eight cut diamonds in open back grain setting with a combined weight of 1.00 carats. The total approximate diamond weight is 2.70 carats, to a curving bombé cocktail design featuring sweeping polished edges, a structural gallery and open backholing, leading to smooth shoulders and flowing through to a solid flat shank. Marked platinum, engraved
Marked platinum and 'BO 518', circa 1950.