Diamond coronet cluster ring. Set to centre with a cluster of nine round old cut diamonds in open back grain settings with a combined approximate weight of 0.60 carats, encircled by an outer single row of twenty round eight cut diamonds in open back grain settings with a combined weight of 0.60 carats. The total approximate diamond weight is 1.20 carats, to a coronet cluster design featuring millegrain edges, an intricately pierced gallery and fancy open backholing, flanked by raised inward tapered shoulders supported by cheniers, flowing to a solid D-shape shank. Marked platinum, makers mark 'H.C.', circa 1915.