Silver Blue John Marcasite Pear Drop Stud Earrings. E2236. These stunning drop stud earrings feature pear shaped hand carved Blue John gemstones set at the heart of a Sterling Silver and Marcasite frame. These earrings use only the finest Blue John stone which has been sourced directly from Treak Cliff Cavern in Castleton. They hang elegantly from sterling silver studs. 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 Pear Drop Stud Earrings. Total size 32x9mm, Blue John stone 14x5mm.