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Oscar Heyman square diamond eternity ring. Set with twenty one square step cut diamonds, approximately F-G colour, approximately VVS-VS1 clarity, with an approximate combined weight of 3.39 carats, in open back rubover channel settings, to a smoothly conforming full eternity band with square pierced backholing, approximately 4.0mm in width. Marked platinum, maker's mark for Oscar Heyman Brothers, numbered 'W1788', American.