During the 19th century, valleys were transformed into real “industrial boulevards” in which modest workshops and major factories can be found and where several types of production either cohabited or succeeded one another. Fulling mills, grain mills, sawmills, wood turning factories, diamond factories, etc.: several hamlets underwent industrial growth and changes in names, sometimes resulting from the rapid change in rural differences. Thus, the hamlet “la Patinerie”, in the municipality of Villard-Saint-Sauveur, became “Montbrillant” in 1885 to reflect the new diamond industry that had developed in the High-Jura.