Art Deco diamond cluster ring. Centrally set with a round old cut diamond in an open back grain setting with an approximate weight of 1.20 carats, surrounded by a single row of ten round old cut diamonds in open back grain settings with a combined weight of 1.00 carats and further encircled by a row of twenty round eight cut diamonds in open back grain and rubover settings with a combined weight of 0.50 carats. The total approximate diamond weight is 2.70 carats, to an elegant cluster design featuring millegrain borders, a decoratively pierced openwork gallery and open backholing, leading to by geometric scrolled shoulders and flowing through to a smooth D-shape shank. Tested platinum, circa 1920.
