oSIST prEN ISO 23345:2026

SLOVENSKI STANDARD
01-januar-2026
Nakit in plemenite kovine - Neporušitvena potrditev čistosti plemenitih kovin z
analitično tehniko ED-XRF (ISO 23345:2021)
Jewellery and precious metals - Non destructive precious metal fineness confirmation by
ED-XRF (ISO 23345:2021)
Schmuck und Edelmetalle - Zerstörungsfreie Bestätigung des Feingehalts von
Edelmetallen durch ED-XRF (ISO 23345:2021)
Joaillerie, bijouterie et métaux précieux - Confirmation du titre de métal précieux par
analyse non destructive ED-XRF (ISO 23345:2021)
Ta slovenski standard je istoveten z: prEN ISO 23345
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
39.060 Nakit Jewellery
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 23345
First edition
2021-06
Jewellery and precious metals — Non
destructive precious metal fineness
confirmation by ED-XRF
Joaillerie, bijouterie et métaux précieux — Confirmation du titre de
métal précieux par analyse non destructive ED-XRF
Reference number
ISO 23345:2021(E)
©
ISO 2021
ISO 23345:2021(E)
© ISO 2021
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Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 23345:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Procedure. 2
6.1 Calibration . 2
6.1.1 Calibration standards . 2
6.1.2 Method calibration . 3
6.2 Verification . 3
6.2.1 Reference material . 3
6.2.2 Method verification . 3
6.3 Analysis. 4
6.3.1 Sample preparation . 4
6.3.2 Sample analysis . 4
7 Calculation and expression of the results . 4
7.1 Calculation . 4
7.2 Uncertainty . 4
7.3 Result interpretation . 5
8 Test report . 5
Bibliography . 7
ISO 23345:2021(E)
Foreword
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This document was prepared by Technical Committee ISO/TC 174, Jewellery and precious metals.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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iv © ISO 2021 – All rights reserved

ISO 23345:2021(E)
Introduction
This document describes a non-destructive method to verify (confirm) the fineness of finished
and semifinished jewellery items considered homogeneous by ED-XRF (energy-dispersive X-ray
fluorescence).
Multiple methods are available to determine the fineness of precious metal alloys. They however are
all requiring the destruction of the sample and long analysis time; for example gold cupellation by
ISO 11426. Under some circumstances, destruction of the sample is not an option. This method proposes
a non-destructive alternative, which allows validating a declared fineness.
The standard is not suitable for the regulatory hallmarking application. Because of the inherent higher
uncertainty associated with ED-XRF measurements, some results might be inconclusive.
The document gives guidelines on the
— instrumentation,
— number and composition of calibration standards needed for calibration,
— composition of reference material needed to verify the calibration,
— number of measurement and replicates on the sample whose fineness is to be verified
— uncertainty calculation, and
— interpretation of the results.
INTERNATIONAL STANDARD ISO 23345:2021(E)
Jewellery and precious metals — Non destructive precious
metal fineness confirmation by ED-XRF
1 Scope
This document describes a non-destructive method to verify (confirm) the precious metal fineness of
finished and semifinished jewellery item(s) considered homogeneous by E
...