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Vintage old cut diamond solitaire ring. Set with a round old cut diamond in an open back grain setting with an approximate weight of 0.60 carats, to a geometric stylised collet framed with dual square borders with angular details and intricately pierced backholing, the integrated broad trumpeting shoulders gently taper to a solid shank. Tested yellow gold and platinum, indistinct maker's mark, French, circa 1940.