A magnificent diamond single-stone ring, circa 1940L. photo courtesy Bonham's

The Asscher-cut diamond, weighing 6.82 carats, between stepped baguette-cut diamond shoulders, ring size I, cased by Saqui & Lawrence Ltd. Sold for £322,400

Footnote: Accompanied by a GIA certificate stating that the diamond is D colour, VVS2 clarity, potentially flawless. Certificate number 110202035801, dated 14 June 2010.

Also accompanied by a GIA certificate stating that the diamond is type IIA. Certificate number 2125219268, dated 10 June 2010.

Bonham's. Fine Jewellery, 22 Sep 2010. New Bond Street www.bonhams.com