An impressive diamond single-stone ring, by De Beers

The emerald-cut diamond, weighing 11.05 carats, within a four-claw setting, signed De Beers and numbered, ring size O½, maker's presentation case. Estimate: £260,000 - 320,000

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Bonhams. Fine Jewellery, 25 Sep 2008. New Bond Street. www.bonhams.com