Blue John Bracelet Framed Marquise Link 9 Stone 9ct Yellow Gold. B462. This exquisite bracelet boasts nine delicate oval shaped pieces of rare Blue John stone that has been sourced directly from Treak Cliff Cavern in Castleton. The stones are set within an enchanting 9ct yellow gold chain that hangs gracefully around the wrist and fastens by a classic toggle clasp for easy wear. 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 bracelets on our website. 9ct Yellow Gold and Blue John.