Silver Rectangular Cufflinks Opart Diamond Design. A beautiful pair of Silver Rectangular cufflinks with a deep engraved Opart Diamond pattern. The Opart Diamond Cufflinks have a swivel T-bar Fastening and are fully hallmarked. Made by our Silversmith in the UK and presented in a smart cufflink box. Please note, the box may vary in colour or shape depending on availability. A lovely gentleman`s gift for any occasion and are offered with T-bar fittings. The Cufflinks are made by our Silversmith, are fully hallmarked and are gift boxed.