Silver Whitby Jet Marcasite Garnet Owl Necklace. P2980. This adorable necklace features a beautifully hand carved Whitby Jet gemstone sourced directly from the north east coast of Yorkshire, sparkling Marcasite gemstones, and two stunning garnet set eyes. It is an exquisite and detailed piece which would make a beautiful gift. It hangs beautifully from an 18 inch fluid sterling 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 and other Whitby Jet necklaces on our website. Silver Whitby Jet Marcasite Garnet Owl Necklace. 30x14mm, Whitby Jet 9x9mm.