Vintage Oscar Heyman Brothers diamond band ring. Set with twenty one round brilliant cut diamonds in open back platinum grain settings with fine rubover edging and an approximate combined weight of 1.87 carats, to a smooth conforming band set within heavy ridged yellow gold borders with intricate pierced square backholing, approximately 7.5mm in width. Marked 18 carat yellow gold and platinum, maker's mark for Oscar Heyman Brothers, numbered 'W4143', American, circa 1960, accompanied by Oscar Heyman Brothers authenticity certificate.
