Important Oscar Heyman Sapphire Diamond Gold Platinum Ring

Important Oscar Heyman Sapphire and Diamond ring set in 18k gold and platinum. The ring is centered by a 12.16ct (estimated) ceylon untreated unheated blue sapphire with an AGL report #CS 45264. The ring is also set with over 5 carats of gem quality oval brilliant diamonds and 1.20 carats of fancy yellow round brilliant cut diamonds. Circa 1960s. Stamped “99754”