Pair of English Regency Blue John (Derbyshire Spar) Urns, 19th Century

Description:

Obtained from the Derbyshire England, Blue John is a semi-precious mineral, a rare form of fluorite composition with bands of a purple-blue or yellowish colour. It is extracted from the Blue John Cavern, one of the four show caves in Castleton. Broadly speaking, this alluring stone is found in the stripe of colors ranging from deep purple to red then dark tones of blue as well as yellow.