A tanzanite and diamond dress ring, 2007, the pear-shaped tanzanite, weighing 13.91 carats, mounted in a four-claw setting, each claw inlaid with a brilliant-cut diamond, between similarly-set diamond shoulders, mounted in 18ct white gold, London hallmark, maker’s mark ‘N.C.K’ for Nick Kellett, total diamond weight 0.29 carat, ring size L. £1,600-£2,000