Silver Whitby Jet Marcasite Twisted Round Pendant Necklace. P2137. This petite romantic pendant boasts a highly polished Whitby Jet stone sourced directly from the north east coast of Yorkshire. The stone is set at the heart of a sterling silver pendant which is embellished with a dazzling marcasite stones, giving the piece a sophisticated sparkle. The pendant hangs from a fluid 18 inch long sterling silver chain complete with a classic bolt ring clasp for easy wear. 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 Twisted Round Pendant Necklace. Pendant 26x17mm including bale.