An onyx and diamond pendant necklaceThe lozenge-shaped onyx plaque inlaid with a brilliant-cut diamond, within a pierced geometric surround, millegrain-set throughout with old brilliant and single-cut diamonds, to an 18 carat white gold triple-stranded cable-link chain with hoop spacers, diamonds approx. 1.00ct total, clasp with sponsor's mark, partial UK hallmark and European Convention mark, lengths: pendant 5.8cm, chain 46.5cm