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Carving medieval rock crystal?

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What tools were used to carve the amazing medieval rock crystal cups, jugs etc?

I've cut all the engineering steels but cannot make a mark on hard rock.

Just seen a pix of a 1000 year old crystal flask and cannot imagine how to carve the stone let alone make a beautiful finish.

Flask had small neck then typical fat body so what was used to get inside and cut let alone polish it?
asked Nov 3, 2016 by rosewhite (140 points)

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