Van Cleef & Arpels vintage diamond bombé ring. Set with one central round old cut diamond in an open back six claw setting with a weight of 1.00 carat, encircled with eight round brilliant cut diamonds in open back claw settings with a total weight of 2.70 carats and further framed with eighteen rectangular baguette cut diamonds in open back rubover channel settings with a total weight of 1.80 carats. The total approximate diamond weight is 5.50 carats, to an openwork bombé cluster design, finely pierced gallery with fancy shaped backholing, solid trumpeting shoulders and terminating in a D-shaped shank. Marked platinum, makers mark and signed Van Cleef & Arpels, numbered '7610 C.S.' French, circa 1963, accompanied by Van Cleef and Arpels certificate of authentication.