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A diamond single-stone ring, circa 1915. Photo Bonhams.

The cushion-shaped diamond, weighing 10.77 carats, within a finely pierced platinum mount millegrain-set with old brilliant and single-cut diamonds and further engraved decoration, ring size M. Estimate £50,000 - 60,000 (€60,000 - 73,000)

Bonhams. FINE JEWELLERY, London, New Bond Street, 30 Apr 2014 - www.bonhams.com