Yellow Gold Plated Sterling Silver Signature Octo Cufflinks with Black Onyx Our new signature cufflinks feature an octagonal case with bevelled edges engraved with our classic diamond pattern. This style has been set with onyx in a 1 micron yellow gold plated sterling silver case. Additional Information Material: Yellow gold plated sterling silver Stone: Black onyx Size: The face of each cufflink measures 14mm length x 14mm height x 3mm width.