Illegal. According to the Anti-Unfair Competition Law and the Advertising Law, it can be seen that brushing the bill violates the crime of false advertising and disrupting production and operation. If a business operator provides false or misleading commercial publicity for his goods, the supervision and inspection department shall order him to stop the illegal act and impose a fine of more than 200,000 yuan/kloc-0.00 million yuan. Thus, it is illegal to brush jewelry.