A diamond 3.02 carats single-stone ring, by Bulgari

The rectangular step-cut diamond with cut-corners, weighing 3.02 carats, within a four-claw setting and between tapered baguette-cut diamond shoulders, signed Bulgari and numbered, ring size L, cased. Estimate: £20,000 - 25,000

Accompanied by a certificate from the Gemmological Association of Great Britain, stating that the diamond is G colour, VS2 clarity. Certificate number 17691, dated 2nd July 2008.

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