Precious Metal Control

Official hallmark "head of a St. Bernhard dog"
Official hallmark "head of a St. Bernhard dog"

The Swiss Precious Metal Control is a part of us.

It carries out industrial policing tasks in pursuance of the Federal Law on Precious Metals Control and offers services in the field of precious metals analyses.

Some 40 specialists - sworn assayers - carry out industrial police duties at the Office for Precious Metal Control in Bern and in five Assay Offices. They check the authenticity of the precious metals produced in Switzerland and those imported into the country, thereby protecting consumers from counterfeits and manufacturers from unfair competition.

Each year more than 1 million items are given the official hallmark. Controls uncover well over 2,000 cases of counterfeit goods or false information every year.

Touchstone testing
Touchstone testing

During touchstone testing, the item under test is compared with a reference alloy. The marks left on the touchstone are brushed with an acid, which is then absorbed by blotting paper.
Differences in purity are clearly visible to an experienced assayer. For an accurate analysis, the precious metal sample under test is first weighed and then cupelled. The purity of a precious metal item can also be assessed using X-ray fluorescence.

Further information


Precious metal control offices

Addresses of the precious metal control

Precious stones laboratory

Swiss Gemmological Institute
Aeschengraben 26
CH-4051 Basel

+41 61 262 06 40
+41 61 262 06 41


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