Cufflinks by Josef Koppmann Stunning 24ct gold and silver cufflinks with amethyst. The cufflinks are handmade using sterling silver. The amethyst is set onto solid 24 carat gold and a hinged bar, soldered on the back of the square, snaps securely into place when worn. Features Primary Material : 24ct gold and silver Other Materials : amethyst Fitting Type : hinged bar Dimensions (mm) : 30x11x11 One of a Kind : Yes Metal : 24ct gold and silver Gems : amethyst Hallmarked : Yes Cleaning InstructionsThe cufflinks are best kept clean by rubbing and brushing them gently under running water with bicarbonate of soda. Do not submerge in water for long periods and do not clean the cufflinks in ultrasonic cleaning systems.