Silver Blue John Marcasite Three Pear Drop Necklace. N998. This stunning pendant features three slim pear drop shaped hand carved Blue John gemstones set at the heart of Sterling Silver and Marcasite frames. A very eye catching pendant with a vintage feel, this piece uses only the finest Blue John stone which has been source directly from Treak Cliff Cavern in Castleton. The pendant hangs beautifully from a fluid 46cm 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 online and instore. Silver Blue John Marcasite Three Pear Drop Necklace. Large Blue John Pear 23x6mm, Two small Blue John Pears 15x4mm.