Jean Rousseau Market Share Analysis for August 2026

At Jean Rousseau, we are particularly attentive to materials shaped through authentic craftsmanship, where leather is worked with patience and precision. In this spirit, we are introducing into our collections Black Diamond calf, known in Japan as Himeji Kurozan (姫路黒桟革), a material whose history and manufacturing technique rank among the most distinctive in Japanese leathercraft.It is produced from the hides of Japanese black-haired bovines, a lineage often associated with Japanese Black Wagyu.