What makes this collection significant is the volume which is hitting the market at once, a rarity for Blue John pieces.

The mining of fluorspar first began in 1760 in Derbyshire, near Castleton. Extraction and stone carving took place in Derbyshire, before the objects were exported to France to be mounted in bronze.

The material is a semi-precious mineral and is found only in Derbyshire's Blue John Cavern and Treak Cliff Cavern at Castleton. In 1768, industrialist Matthew Boulton wrote a letter in an attempt to purchase the mines to create ormolus.

By the 19th century, Blue John was being used for a variety of objects, including dining sets and candelabras. Today, production continues in Castleton, where jewellery is mainly manufactured.

The mines of Derbyshire are an integral part of the landscape, Sir Arthur Conan Doyle's The Terror of Blue John Gap, 1910, is set within the Blue John mining caves.

All items featured will be included in Muizon-Rieunier's sale on 4th July, 2016. Check out the full catalogue here.