1960s diamond openwork cluster ring in platinum and 18kt white gold. Centrally set with a round Old European cut diamond in a rubover setting, encircled by a graduating row of round Old European cut diamonds in platinum rubover settings, to a radiating cluster design with negative open details, millegarin lines, pierced structured gallery and flanked by raised inwardly tapering shoulders with ribbed terminals joining to a solid shank. Estimated total diamond weight 1.90cts. Hallmarked 18kt gold, platinum, French.