World of Faceting Machines Ep.20 : Blue John 

This episode features Blue John stone as it is mined, cut, and polished in Castleton, England.
To learn more about Blue John and Treak Cliff Cavern, check out : bluejohnstone.com
For more information on the history of gem cutting, please visit www.facetinghistory.com
Additional Footage was used from the following videos:
• Blue John (1963)
• Video
• Crafting Blue John Jew...