What is the ruling on using raw materials that contain a percentage of gold in decorating ceramic tiles and sanitary ware, and what is the ruling on working in the design and implementation of these supplies, and selling and buying them, if the price of gold does not affect the overall price?

It is not permissible to use gold for decorating floors, walls, and bathrooms, due to the authentic narrations from the Prophet (peace be upon him) prohibiting the use of gold and silver vessels. This prohibition includes all their uses in eating, drinking, adornment, and the embellishment of walls and doors. Furthermore, it involves extravagance and squandering of wealth, spending it improperly, and "indeed, squanderers are brothers of devils." (Quran 17:27) And that which is forbidden to use is also forbidden to manufacture and sell.