IS 18458 : 2023 Jewellery and Precious Metals - Ed-XRF Test - Method of Test
1 SCOPE
This document describes a non-destructive method of test to ensure homogeneity of the major element in the lot and to detect presence of the prohibited elements, by ED-XRF (energy dispersive X-ray fluorescence).
The document also describes a nondestructive method to verify (confirm) the precious metal fineness and of finished and semi-finished jewelry item(s), considered homogeneous by ED-XRF and a destructive method wherein sample is prepared as in case of fire assay, however instead of fire assay, XRF is done on prepared sample (see Annex A).
2 REFERENCES
The standards given below contain provisions which through reference in this text, constitute provision of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of these standards:
| IS No. | Title |
| IS 1417 : 2016 | Gold and gold alloys, jewellery/artefacts - Fineness and marking - Specification (fourth revision) |
| IS 1418 : 2009 | Determination of gold in gold bullion, gold alloys and gold jewellery/artefacts - Cupellation (fire assay) method (third revision) |
| IS 2112 : 2014 | Silver and silver alloys, jewellery/artefacts - Fineness and marking - Specification (third revision) |
| IS 15820 : 2009 | General requirements for competence of assaying and hallmarking centres |
| IS 16179 (Part 1) : 2014/ISO 10576-1 : 2003 | Statistical methods - Guidelines for the evaluation of conformity withspecified requirements: Part 1 General principles |
| IS/ISO/IEC 17025 : 2017 | General requirements for the competence of testing and calibration laboratories (second revision) |
| IS/ISO 17034 : 2016 | General requirements for the competence of reference material producers |