Sterling silver blue john triangle knot celtic necklace p261 this elegant necklace features hand carved whitby jet that has been sourced directly from the derbyshire blue john cavern in castleton the highly polished blue john gemstone is framed within a unique sterling silverceltic design with the pendant being presented on a 18 sterling silverchain the necklace is completed with a classic bolt ring for easy wear all our blue john jewellery is designed and crafted within our very own wor