18ct white gold blue john oval 008 carat diamond pendant necklace sh5 18bj this stunning pendant boasts astrikingoval shaped piece of multi faceted 1989 carat blue john stone that has been sourced directly from treak cliff cavern in castleton the blue john stone is claw set within 18ct white gold and paired with a dazzling 008 carat diamond the pendant hangs from afluid 18 inch long 18ct white gold chain all our blue john jewellery is designed and crafted within our very own workshop