The Swiss watch and clock industry appeared in Geneva in the middle of the 16th century. In 1541, reforms implemented by Jean Calvin and banning the wear of jewels, forced the goldsmiths and other jewellers to turn into a new, independent craft : watchmaking. By the end of the century, Genevan watches were already reputed for their high quality, and watchmakers created in 1601 the Watchmakers' Guild of Geneva, the first to be established anywhere. One century later and because Geneva was already crowded with watchmakers, many of them decided to leave the city for the receptive region of the Jura Mountains.