9ct Yellow Gold Blue John Open Heart Twist Necklace, P3130. An elegant pendant which features a hand carved heart shaped Blue John gemstone, which is sourced directly from Castleton in Derbyshire. The beautiful stone is framed by an open Celtic style heart shaped framework of solid 9ct yellow gold. The price of this product includes an 18 inch 9ct yellow gold chain. Dimensions: 27mm x 20mm, Blue John; 12mm x 9mm. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Matching items are available within this collection.