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This document was prepared by Technical Committee ISO/TC 174, Jewellery and precious metals, in collaboration with the European Committee for Standardization (CEN), in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fourth edition cancels and replaces the third edition (ISO 9202:2019), which has been technically revised.

The main changes are as follows:

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.