Laurent Picciotto, Chronopassion and the Hydro Mechanical Horologists (HYT) Ion Schiau, Xavier Casals and Vincent Perriard.
© Stéphane de Bourgies.
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Unit for measuring the content of gold alloys. The pure gold content of an alloy of 1 carat is 1/24th of the weight of the alloy. An alloy of 12 and 18 carats contains 12/24ths and 18/24ths of gold respectively. Pure gold is therefore 24 carats.