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Gold

The carat is a unit of purity for gold alloys (24-carat gold = 100 % pure gold ). Tissot uses 18-carat gold ( 75 % pure gold ) in the manufacturing of its watch cases and bracelets. Depending on the required colour, the alloy changes slightly : - 18K yellow gold is generally made of 75 % gold, 12.5 % silver and 12.5 % copper ; - 18K rose gold is obtained by adding more copper than silver ; - 18K white gold is obtained by adding more silver ( or palladium ) than copper.