9ct yellow gold whitby jet square cushion cufflinks cl128 a perfectly symmetrical cushion shaped whitby jet stone is set into 9ct yellow gold and fitted with a durable swivel t bar fastening the ideal combination of individuality and enduring style encapsulated in a cufflink giving a smart and professional appearance all our whitby jet jewellery is designed and crafted within our very own workshops in derbyshire where a team of skilled craftsmen turn the raw jet into these stunning pieces of