18ct Yellow Rose Gold Whitby Jet Diamond Lyria Necklace. CMT116. This unique pear shaped Whitby Jet and Diamond drop pendant is set in 18ct Rose Gold. An array of sparkling diamonds totaling 0.46 carats add unique detail to the pendant. It is a sophisticated and stunning design featuring Whitby Jet stone which has been sourced directly from the North East coast of Yorkshire. 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 jewellery. You can find other matching Whitby Jet jewellery and other Whitby Jet rings on our website. 18 inch long chain, pendant drop 55mm, Whitby Jet; 35mm x 22mm.