18ct White Gold Whitby Jet 0.15ct Diamond Set Rhombus Necklace, P2833. This elegant necklace features a claw set round central stone of Whitby Jet held within a frame of pave set brilliant cut diamonds which have also been set within the bail to complete this design. Diamond Total; 0.15ct. The price includes an 18 inch white gold chain. Dimensions: 15mm x 8mm, Whitby Jet; 4mm x 4mm. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Matching items are available within this collection.