Concerning the trade in products made of precious metals, the Court of Justice of the EU has previously stated that Member States cannot require a fresh hallmark to be affixed to products imported from another Member State in which they have already been lawfully marketed and hallmarked in accordance with the legislation of that State, provided that the information on the hallmark is equivalent to that prescribed by the Member State of importation and also intelligible to consumers of that State.
Väärismetallist valmistatud toodetega kauplemise puhul on Euroopa Liidu Kohus varem nentinud, et liikmesriigid ei tohi nõuda uue proovimärgise kandmist tootele, mis on imporditud teisest liikmesriigist, kus toodet on seaduslikult turustatud ja kus toode on selle liikmesriigi seaduste kohaselt märgistatud mis tahes kujul, mis on samasugune importivas liikmesriigis ettenähtud märgistusega ja mida kõnealuse liikmesriigi tarbijad tunnevad.