Curling stones are made by a company called Kays of Scotland, which is located in southwest Scotland. The granite that the company uses to make the stones is mined from Ailsa Craig, a small island off the west coast of Scotland.
Curling stones are also made in Canada by Canadian Curling Stone Co., which uses granite from Trefor quarry in Wales, U.K.
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Curling stones are made by two companies. One company gets its curling stone granite from a quarry on an island off the coast of Scotland; the other gets its granite from a quarry in Trefor, Wales.
They are made from Granite which comes from a particular mountain in Scotland. they currently use inserts on the bottom of the rocks to conserve the amount of granite being consumed.