18ct rose gold jet diamond necklacecmt 119 this gorgeous 18ct rose gold necklace features carved whitby jet and 18ct rose gold open cushion shaped links at intervals along the chain the clasp is concealed as part of the design and is set with a single brilliant cut diamond of 003ct in weight all our whitby jet jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsmen transform natural pieces of whitby jet into these stylish p