René Boivin marquise diamond coronet cluster ring. Set to centre with a marquise shape old cut diamond in an open back grain setting, with an approximate weight of 1.00 carat, encircled by twenty two round eight cut diamonds in open back grain settings, with a combined weight of 0.22 carats, flanked further by three round eight cut diamonds in open back grain settings, six in total, with a combined weight of 0.06 carats. The total approximate diamond weight is 1.28 carats, to an impressive coronet cluster design featuring polished borders, an intricately pierced gallery and fancy open backholing, flanked by slightly raised shoulders that flow through to a concave shank. Tested platinum, makers mark 'RB' for René Boivin, French, circa 1920.
