What is ISO 23345 about?
ISO 23345 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.
Note 1: ISO 23345 is not suitable for any coated items. WD-XRF (wavelength dispersive X-ray fluorescence) equipment cannot be used.
Note 2: ISO 23345 is not suitable for the regulatory hallmarking application. Because of the inherent higher uncertainty associated with ED-XRF measurements; some results might be inconclusive.
Who is ISO 23345 for?
ISO 23345 on the non-destructive precious metal fineness is applicable for:
- Jewellers
- Jewellery designers
- Quality control laboratory
- XRF analyzers
Why should you use ISO 23345?
Multiple methods that are available to determine the fineness of precious metal alloys. They however are all require the destruction of the sample and long analysis time, for example, gold cupellation.
ISO 23345 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).
ISO 23345 gives guidelines on the instrumentation, number and composition of calibration standards needed for calibration, the 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.