18ct White Gold Square Blue John 0.18 Carat Diamond Stud Earrings. E1334. These unmissable stud earrings boast two stunning square shaped pieces of rare Blue John stone that have been directly sourced from Treak Cliff Cavern in Castleton. The stone is placed within an exquisite 18ct white gold earring setting and surrounded by dazzling 0.18 carat brilliant cut diamonds, creating a breathtaking sparkle. All of 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. The earrings are stunning alone or when paired with one of the matching Blue John bracelets or Blue John Necklaces on our website. Thanks to the surrounding diamonds, the earrings also look beautiful with diamond jewellery. 18ct White Gold Square Blue John 0.18 Carat Diamond Stud Earrings