Silver Blue John Marcasite Long Oval Pyramid Bead Edge Necklace. P2116. This stunning pendant features an oval shaped hand carved Blue John gemstone set at the heart of a Sterling Silver and pyramid beaded Marcasite frame. A very eye catching pendant with a vintage feel, this piece uses only the finest Blue John stone, which has been sourced directly from the Treak Cliff Cavern in Castleton, Derbyshire. The pendant hangs beautifully from a fluid 18" silver chain. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen turn the raw Blue John stone into these stunning pieces of jewellery. You can find other matching Blue John jewellery and other Blue John necklaces on our website. Silver Blue John Marcasite Long Oval Pyramid Bead Edge Necklace. Pendant 21x50mm including bail.