Cufflinks by Josef Koppmann Stunning 24ct Gold, Silver and White Druzy Agate cufflinks. The cufflinks are handmade using sterling silver. The white druzy agate is set into 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 sterling silver Other Materials : white druzy agate Fitting Type : hinged bar Dimensions (mm) : 11xx11x5mm One of a Kind : Yes Metal : 24ct gold and sterling silver Gems : white druzy agate 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.