According to the Jewellery and Costume Jewelry Law (RJOC), approved by Law 98/2015, of August 18, an article with precious metal is legally marked when it has the following hallmarks:

  1. Liability punch mark, manufacture or equivalent;
  2. Legal marks of the Portuguese Contrasting Punch:

The responsibility punch, manufacturing punch or equivalent is the punch containing the identifying engraving of the person responsible for placing the article with precious metal on the market and reproducing a mark with a private design and a letter of the first name, the surnames or the company name, being the design and the letter visibly distinct and enclosed in a peripheral outline.