A mother-of-pearl, diamond and onyx dress set and a pair of onyx and diamond cufflinks

A mother-of-pearl, diamond and onyx dress set and a pair of onyx and diamond cufflinks
The dress set composed of circular mother-of-pearl panels, each with single cultured pearl collet centre with onyx surround; the cufflinks composed of onyx panels with a brilliant-cut diamond single stone centre with reeded borders and chain-link connections; mounted in silver and gold, circa 1925