A diamond ring set with a central old round cut diamond approximately 0.8cts with baguette cut

A diamond ring set with a central old round cut diamond approximately 0.8cts with baguette cut diamond shoulder to a white metal setting and shank marked "10% Irid Plat", size M, approximately 3.8 grams, with a receipt from Stuhlbach & Son, dated June 6 1932, in original heart shaped box