Blue john necklace open petal design silver p2091rthis enchanting necklace boasts a stunning oval shaped cabochon piece of rare blue john stone that has been sourced directly from the derbyshire blue john cavern in castleton the stone is set within an intricately crafted sterling silver flower design that hangs gracefully from a delicate sterling silver chain complete with a classic bolt ring clasprall our blue john jewellery is designed and crafted within our very own workshops in ashbourne