In Poland, there is a legal requirement to hallmark jewelry containing precious metals. Hallmarks indicate the amount of pure metal in the alloy. 

The obligation of hallmarking applies only to pieces with a precious metal weight of:

• at least 1 gram in the case of gold, 
• at least 5 grams for silver

The image of the hallmark confirms the precious metal content of the alloy from which the jewelry piece was made.

 On the jewelry, you will also find Kamena's name mark which confirms the authorship of the piece.