An onyx and diamond dress set and pair of cufflinks

An onyx and diamond dress set and pair of cufflinks
The dress set comprising a pair of double-sided cufflinks, each terminal set with a circular onyx plaque with brilliant-cut diamond centre, with two matching dress studs, French marks, maker's mark; the other pair of cufflinks with lozenge-shaped onyx terminals with rose-cut diamond line detail (6)