Precious metals such as gold, silver, palladium, and platinum must, by law, be marked so that their characteristics and purity are immediately recognizable. The marking of silver, gold, and precious metals must state:
The identification code, which certifies its origin;
The title of the precious metal is expressed in thousandths (e.g. silver 925, gold 750).
Marking is done on ingots (you can learn more about gold ingot marking here)), rolled, profiled, and semi-finished products used to make items such as currency, jewelry, and cutlery for industrial uses such as in electronics. Marking is also used on precious stones such as diamonds, rubies, sapphires, and gemstones applied in jewelry to certify their authenticity.
Gemstone marking systems
The marking of silver, gold, metals, and precious stones is achieved through different technologies:
Laser: an easy and innovative solution that penetrates the surface