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Old mine diamond solitaire engagement ring. Set to centre with a cushion shape old mine diamond, I colour, SI2 clarity with an approximate weight of 2.50 carats, in an open back claw setting, to an elegant solitaire featuring an intricately pierced collet, curving claws and open backholing, the slightly raised tapering shoulders supported by cheniers, flow to a solid D-shape shank. Marked platinum, Engish, circa 1920, accompanied by HRD Antwerp report #180000003047.