Sterling silver blue john classic rectangle necklace p083 this classic flat smooth pendant featuresa rectangular piece of rare blue john gemstone framed in sterling silver hand carved and polished to a mirror like shine it is sold complete withan 18 sterlingsilver chain all our blue johnjewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsmen transform natural pieces of blue john into these stylish pieces of jewellery