Article 57. Solders Used in The Manufacture or Restoration (Repair) of Jewelry and Other Products Made of Precious Metals and Precious Stones

Solders used in the manufacture or restoration (repair) of jewelry or other products made of precious metals and precious stones must be made on the basis of the same precious metals as the alloys from which these products are made, except for the cases established by this article.

Solders for jewelry or other precious metal products made of gold, platinum and palladium must have the same fineness as the base alloy from which the products are made.

It shall be allowed to have white gold solder of 585 (five hundred and eighty-fifth) and 750 (seven hundred and fiftieth) fineness in jewelry or other products made of platinum and palladium.

Solder for jewelry or other silver products must have a fineness of at least 650 (six hundred and fiftieth) fineness.

Jewelry and other products made of gold containing solder that does not correspond to the fineness of the alloy from which the products are made shall be hallmarked with the next lower fineness than the established (but not lower than 375 (three hundred and seventy-fifth) fineness).

In jewelry or other items made of precious metals and precious stones, use of solder that does not contain precious metals shall be allowed, provided that the fineness of these products, together with the solder, is within the limits of the alloy from which the products are made.