SIST EN ISO 23345:2026
(Main)Jewellery and precious metals - Non destructive precious metal fineness confirmation by ED-XRF (ISO 23345:2021)
Jewellery and precious metals - Non destructive precious metal fineness confirmation by ED-XRF (ISO 23345:2021)
This document describes a non-destructive method to verify (confirm) the precious metal fineness of finished and semifinished jewellery item(s) considered homogeneous by ED-XRF (energy dispersive X-ray fluorescence), including alloys according to ISO 9202.
This document is not suitable for any coated items. WD-XRF (wavelength dispersive X-ray fluorescence) equipment cannot be used.
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)
Nakit in plemenite kovine - Neporušitvena potrditev čistosti plemenitih kovin z analitično tehniko ED-XRF (ISO 23345:2021)
Ta dokument opisuje neporušitveno metodo za preverjanje (potrditev) čistine plemenitih kovin dokončanih in polizdelanih kosov nakita, ki se štejejo za homogene z metodo ED-XRF (energijsko disperzijska rentgenska fluorescenca), vključno z zlitinami v skladu z ISO 9202.
Ta dokument ni primeren za kakršne koli prevlečene predmete. Oprema WD-XRF (valovno disperzijska rentgenska fluorescenca) se ne sme uporabljati.
General Information
- Status
- Published
- Public Enquiry End Date
- 30-Jan-2026
- Publication Date
- 12-Apr-2026
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 31-Mar-2026
- Due Date
- 05-Jun-2026
- Completion Date
- 13-Apr-2026
Overview
prEN ISO 23345 (ISO 23345:2021) specifies a non‑destructive ED‑XRF (energy‑dispersive X‑ray fluorescence) method to confirm the precious‑metal fineness of finished and semi‑finished jewellery and precious‑metal alloys (per ISO 9202). The standard is explicit that it is not suitable for coated items and that WD‑XRF equipment must not be used. It provides requirements for instrumentation, calibration, verification, measurement procedure, uncertainty evaluation and result interpretation.
Key topics and technical requirements
- Instrumentation (ED‑XRF): X‑ray tube adapted for precious metals (minimum 50 kV, 40 W), primary filters, at least two collimators (one <1 mm and one ≥1 mm), camera for spot imaging, detectors (Si‑PIN or SDD), energy resolution ≤160 eV (Mn Kα), detectable elements Z = 22 (Ti) to Z = 92 (U).
- Calibration standards: Minimum of 3 standards with known exact composition, flat/clean surface, thickness ≥0.5 mm, diameter ≥5× collimator, homogeneous; major element compositions should cover a range up to 50 ‰.
- Method calibration and verification:
- Each calibration standard: measured on at least 5 positions; standard deviation for the major element ≤ 1.2 ‰.
- Use a reference material (RM)-preferably a CRM or material prepared under ISO 17034-for calibration verification; RM must not be a calibration standard and should closely match sample composition (major elements within ±10 ‰).
- RM measured on ≥5 positions; difference between measured and declared RM value contributes to uncertainty and must be within specified limits.
- Sample analysis: Clean/prep surface; analyse ≥3 spot positions, each with ≥3 replicates; replicate analysis time equals that used for RM; per‑set standard deviation for the major element must not exceed 1.2 ‰.
- Uncertainty & reporting: Uncertainty is evaluated from the standard deviations of RM and sample measurements plus the RM measurement bias. Results are reported in parts per thousand (‰) as the mean of all measurements.
Practical applications and users
- Quality control and incoming‑goods inspection in jewellery manufacturing
- Non‑destructive fineness confirmation in retail and repair settings
- Assay laboratories and metrology/quality assurance teams seeking rapid verification without consuming samples
- Customs and trade‑compliance checks where preserving the item is required
Note: ISO 23345 is intended for confirmatory, non‑destructive testing; it is not suitable for regulatory hallmarking because ED‑XRF generally yields higher measurement uncertainty than destructive assay methods.
Related standards
- ISO 9202 - alloys terminology and classification
- ISO 11426 - example destructive gold cupellation method (for comparison)
- ISO 17034 - reference material producer accreditation (CRMs)
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Frequently Asked Questions
SIST EN ISO 23345:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Jewellery and precious metals - Non destructive precious metal fineness confirmation by ED-XRF (ISO 23345:2021)". This standard covers: This document describes a non-destructive method to verify (confirm) the precious metal fineness of finished and semifinished jewellery item(s) considered homogeneous by ED-XRF (energy dispersive X-ray fluorescence), including alloys according to ISO 9202. This document is not suitable for any coated items. WD-XRF (wavelength dispersive X-ray fluorescence) equipment cannot be used.
This document describes a non-destructive method to verify (confirm) the precious metal fineness of finished and semifinished jewellery item(s) considered homogeneous by ED-XRF (energy dispersive X-ray fluorescence), including alloys according to ISO 9202. This document is not suitable for any coated items. WD-XRF (wavelength dispersive X-ray fluorescence) equipment cannot be used.
SIST EN ISO 23345:2026 is classified under the following ICS (International Classification for Standards) categories: 19.100 - Non-destructive testing; 39.060 - Jewellery. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 23345:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-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: EN ISO 23345:2026
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.
EN ISO 23345
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2026
EUROPÄISCHE NORM
ICS 19.100; 39.060
English Version
Jewellery and precious metals - Non destructive precious
metal fineness confirmation by ED-XRF (ISO 23345:2021)
Joaillerie, bijouterie et métaux précieux - Confirmation Schmuck und Edelmetalle - Zerstörungsfreie
du titre de métal précieux par analyse non destructive Bestätigung des Feingehalts von Edelmetallen durch
ED-XRF (ISO 23345:2021) ED-XRF (ISO 23345:2021)
This European Standard was approved by CEN on 13 March 2026.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23345:2026 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
The text of ISO 23345:2021 has been prepared by Technical Committee ISO/TC 174 "Jewellery and
precious metals” of the International Organization for Standardization (ISO) and has been taken over as
secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2026, and conflicting national standards
shall be withdrawn at the latest by September 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 23345:2021 has been approved by CEN as EN ISO 23345:2026 without any modification.
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
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
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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