Under the terms of the Legal Regime of Goldsmiths and Contrasts (RJOC), approved by Law No. 98/2015, of 18 August, an article with precious metal is legally marked when the marks of the following punches are affixed:

1. Mark of the liability mark, of manufacture or equivalent;

2. Contrast punch mark and touch punch mark when it does not include the touch.

The liability mark, manufactured or equivalent, is the mark that contains the identifying mark of the person responsible for placing the item with precious metal on the market and reproduces a mark with a private design and a letter of the proper name, surnames or your firm, the design and the letter being visibly distinct and enclosed in a peripheral outline.

The contrast punching reproduces a guarantee mark of the legal touch of articles with precious metals, or indicates certain circumstances, and identifies the contrast punching that uses it by defining the perimeter, which consists, respectively, in a curved figure, or in a symmetrical irregular octagon, depending on whether the Contrastarias in Lisbon or Porto (see drawing of the marks).

The symbol varies depending on the metal:

1. Gold - deer head for touches equal to or greater than 800 thousandths and swallow in flight for touches less than 800 thousandths;

2. Silver - eagle's head (turned to the left in the legal touches equal to or greater than 925 thousandths and to the right in the legal touches equal to or less than 835 thousandths);

3. Platinum - parrot head.

4. Palladium - lynx head (facing left).

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The customer can check the table here .