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Antique diamond two stone engagement ring. Vertically set with two round old cut diamonds in open back claw settings with a combined weight of 1.00 carats, each shoulder set with one round old star top diamond and one round old single cut diamond, both set in open back grain and millegrain settings with a combined weight of 0.14 carats. Total approximate diamond weight is 1.14 carats, to elaborate openwork collets with raised sloping shoulders, intricate backholing and a gently tapering D-shape shank. Marked 18 carat yellow gold and platinum, circa 1910.