Diamonds.net is reporting that Tiffany and Co. has sued a restaurant over the restaurants use of the "Tiffany" name. This is an interesting law suit in that Tiffany's deals in jewelry and is certainly well known for its high quality goods. However, the argument here is that a restaurant with the same name will cause confusion with Tiffany and Co.. When a mark is clearly "famous" as the Tiffany and Co. is in the jewelry market courts are more willing to provide protection across different markets. Whether a court is willing to stretch the Tiffany trademark so far as to preclude a restaurant from using that name remains to be seen.