18ct white gold blue john 043 carat diamond cushion stud earringse2002 these elegantstud earrings boast two stunning round pieces of rare blue john stone that has been directly sourced from treak cliff cavern in castleton the stone is setwithin an exquisite 18ct white gold setting and surrounded by dazzling 043 carat brilliant cut diamonds creating a breathtaking sparkle all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a tea