An onyx and diamond dress-set, by Trianon, comprising a pair of cufflinks designed as twin domed onyx plaques, each inset with a brilliant-cut diamond collet, to the chain connections, together with three matching shirt studs, cufflinks signed Trianon, with maker's mark, one shirt stud signed Trianon, cufflinks and one stud mounted in 18 carat yellow gold, two studs mounted in 14 carat gold, diamonds approximately 0.43 carat total, fitted maker's case