Cufflinks by Josef Koppmann Stunning silver amd 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, aquamarine and silver Fitting Type : hinged bar Dimensions (mm) : 12.8x12.8x4 One of a Kind : No Metal : gold 24ct and sterling silver 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.