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ASD Jewellers
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Small family business offering a selection of blue john jewellery. Has secure online shopping.
http://www.asd-jewellers.co.uk/
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Peak Cavern
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The biggest natural cavern in Derbyshire, with the largest entrance to any cave in the British Isles. Site contains information on location and admission prices.
http://www.peakcavern.co.uk
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Speedwell Cavern
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Offers a unique boat journey through the workings of a 200 year old underground lead mine which opens into a network of natural caverns and underground rivers. Details of opening times and prices.
http://www.speedwellcavern.co.uk/
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Treak Cliff Cavern
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The only place in the world where Blue John Stone naturally occurs. Ancient underground caves open all year round. Online tour, information on shop and mail order service. Located in Castleton
http://www.bluejohnstone.com/
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