18ct White Gold Blue John 0.33ct Diamond Round Halo Ring R898 This enchanting ring boasts an unmissable round piece of rare Blue John stone in the centre that has been directly sourced from Treak Cliff Cavern in Castleton. The stone is set within exquisite 18ct white gold and surrounded by a mesmerising halo of 0.33ct brilliant cut diamonds that also run down the shoulders of the classic band. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen turn the raw Blue John stone into these stunning pieces of jewellery. You can find other matching Blue John jewellery and other Blue John rings on our website. 18ct White Gold, Blue John and 0.33ct Brilliant Cut Diamonds.