DescriptionBlue John production - 4 jewellery - Treak Cliff Cavern - Andy Mabbett - 01.JPG
English: For making jewellery, flat slices of Blue John at Treak Cliff Cavern, Derbyshire, England, are marked out and cut into shapes such as circles or ovals, then finished on a grinding wheel. The rear faces (unless the object is double-sided) are painted white, before they are mounted.
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