A natural pearl necklace

The single-strand of fifty-seven natural pearls, measuring 4.8-12.1mm., graduating in size from the centre, to a barrel-shaped clasp set with single, brilliant and baguette-cut diamonds, length 45.0cm. Estimate: £50,000 - 60,000

Accompanied by a certificate from The Gem Testing Laboratory of Great Britain stating that all fifty seven of the pearls were found to be natural. Certificate number 0128295, dated 19th May 2008.

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