Sterling Silver Blue John Marquise Celtic Ring. R463.  This elegant ring features a marquise cabochon hand carved Blue John which has been sourced directly from the Derbyshire Blue John Cavern in Castleton. The highly polished Blue John is framed by a unique Celtic style band of sterling silver. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural Blue John stone into these stylish pieces of jewellery. You can find other matching Blue John jewellery and other Blue John necklaces on our website. Dimensions: Blue John 13x7mm