The apparent austerity of this powerful door of the Christian wall of the city of Valencia built in 1392 by Pere Balaguer, encloses a magnificent and rich decoration of carved stone. The intervention aimed at cleaning the stone promoted by the City Council, allowed an in-depth study of the ornamentation that had not been previously carried out. A graphic study of all the pieces of carved stone that decorate the Towers was made. The different types of decoration carved in stone were established according to three parameters: according to their function, according to the theme or ornamental motif and according to the type of size used. Likewise, comparative analyzes were established with other buildings constructed in the Crown of Aragon at the same time. This study showed the influences and collaborations between stonework workshops that worked in different geographical points.