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Oscar Heyman diamond fishtail guard ring. Set with eleven round brilliant cut diamonds, approximately F-G colour, approximately VVS-VS1 clarity, with an approximate combined weight of 0.32 carats, in open back half rubover settings, to a smoothly conforming half eternity band with a fishtail gallery and circular pierced backholing, and terminating in a tapering D-shape shank, approximately 2.0mm in width. Marked platinum, maker's mark for Oscar Heyman Brothers, numbered 'W3018', American.