Sapphire Diamond and Platinum Cluster Ring, Circa 1930

A French sapphire and diamond cluster ring, set with an approximately 1.72ct, unheated, oval, native-cut, Ceylon sapphire in a four claw setting, surrounded by ten, old-cut diamonds in grain and rub over settings, with eight-cut diamonds set in millegrain edged shoulders, with an open basket bezel, mounted in platinum, with a French dog head mark, circa 1930.