18ct yellow gold blue john 147 carat diamond ring r469 this dazzlingdressring boasts a stunning domed oval cabochonof rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone is embraced byan exquisite 18ct yellow gold setting and surrounded by sparkling147 carat pave diamonds the ring is completed by a classic 18ctyellow gold band all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire wher