Whitby Jet Necklace Foxtail Three Stone Marquise Silver. N967. This exquisite statement necklace is part of our Foxtail collection and boasts three stunning cabochon tear drop shaped pieces of the finest Whitby Jet stone that has been sourced directly from the north east coast of Yorkshire. The stones are set on a sterling silver chain embellished by the striking foxtail detailing. 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 necklaces on our website. Sterling Silver and Whitby Jet.