Silver Whitby Jet Marcasite Fancy Pear Necklace. P2979. This stunning pendant features a pear shaped hand carved Whitby Jet gemstone set at the heart of a double Sterling Silver and Marcasite frame. A very eye catching pendant with a vintage feel, this piece uses only the finest Whitby Jet stone which has been source directly from the north east coast of Yorkshire. The pendant hangs beautifully from a fluid 18" silver chain. 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 on our website. Silver Whitby Jet Marcasite Fancy Pear Necklace. 45mm x 25mm, Whitby Jet; 13mm x 9mm.