A diamond rivière necklace, signed Moboco, composed of 131 slightly graduated brilliant-cut diamonds in linked claw settings, to a small hinged panel clasp set with brilliant and baguette-cut diamonds, clasp stamped ‘10% IRID PT’ for platinum and ‘750’, signed and bearing maker’s mark ‘MB’, in signed Moboco green leather case, total diamond weight approximately 22.4 carats, necklace length 50cm. £26,000-£30,000

MOBOCO are jewellers from Newport Beach, Florida, who specialise in fine diamond jewellery.

The necklace is accompanied by a copy of the ‘Certificate of Appraisal’ from Moboco, dated 8 March 1996, Report No: MB7801, estimating the gradings of the 131 diamonds as F colour and VVS1 clarity, the weights for the individual diamonds ranging from approximately 0.30 to 0.10 carats. The diamond weight of the clasp is estimated at 0.54 carats.