18ct yellow gold oval blue john 157 carat pave diamond necklace p1451c this classic elegant pendantnecklace boasts a stunning oval cabochon piece of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone is nestled within exquisite 18ct yellow gold that has been embellished by dazzling 157 carat diamonds around the edge and on the bail for an eye catching finish the pendant hangs gracefully from an 18ct yellow gold chain that is fastened by a c