Precious Metal Control


  • The provisions about precious metals control regulate the trade with articles in gold, silver, platinum, palladium and articles coated with precious metals.
  • The prescription are valid as well for precious metal articles, as for articles coated with precious metals.
  • In Switzerland, precious metals articles must bear the mark for a standard of fineness and a responsibility mark registered at the Central Office for Precious Metals Control.
  • Precious metal watch-cases must be officially hallmarked (official hallmark for all precious metals and for all legal standards is the "head of a St. Bernhard dog").
  • Switzerland is member of the "Vienna Convention", which means that the "Common Control Mark" stamped in addition to the "head of a St. Bernhard dog" on gold, silver, platinum and palladium articles facilitates the exportation of goods to the other contracting States of this international agreement.
  • On importation, the Precious Metals Control carries out risk-based controls; it supervises the internal market of precious metals articles.
  • The Swiss Precious Metals Control is accredited in accordance with SN ISO 17025 as testing laboratory STS 071 for analysis of gold, silver, platinum and palladium.


  • Determination of the fineness of gold, silver, platinum and palladium alloys.
  • Examination of the precious metal coatings.
  • Control and official marking.
  • Market supervision and border control.

         On request

  • Analyses of ores, salts, waste and solutions containing Au, Ag, Pd, Pt.
  • Semi-quantitative (non-destructive) analyses on finished articles.


Precious metal control offices

Addresses of the precious metal control

The Science of Gemstone Testing

SSEF Swiss Gemmological Institute
Aeschengraben 26
4051 Basel


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