A mother of pearl and enamel dress set

A mother of pearl and enamel dress set, early 20th century, comprising: four buttons, a pair of cufflinks, and a pair of collar studs, each of circular outline, set with engraved mother of pearl within a black and white enamel border, mounted in gold, buttons and cufflinks 1.4cm diameter, collar studs 0.7cm diameter, each stamped TM18ct, together with four base metal button loops, fitted case stamped Asprey