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Oscar Heyman diamond fishtail guard ring. Set with seven round brilliant cut diamonds, approximately F-G colour, approximately VVS-VS1 clarity, with an approximate combined weight of 0.35 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 18 carat yellow gold, maker's mark for Oscar Heyman Brothers, numbered 'K2319', American.