Cufflinks by Josef Koppmann Stunning silver and aquamarine cufflinks. The cufflinks are handmade with sterling silver. Aquamarines are set in 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 Fitting Type : hinged bar Dimensions (mm) : 21x13x13 One of a Kind : Yes Metal : 24ct gold and sterling silver Gems : sapphires Hallmarked : Yes Finish : satin brushed finish 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.