Silver Blue John Marcasite Pear Drop Rhombus Link Necklace. N894. This stunning statement piece features a large teardrop shaped hand carved Blue John gemstone set in sterling silver accented by sparkling Marcasite gemstones. A very eye catching necklace with a vintage feel, this piece uses only the finest Blue John gemstone. 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 Pear Drop Rhombus Link Necklace. Drop length 50mm x 20mm Turquoise : 23mm x 20mm. Necklace length 18 inches.