Information service

39 Precision mechanics. Jewellery
New standards
EVS-EN ISO 11427:2024
Jewellery and precious metals - Determination of silver - Potentiometry using potassium bromide (ISO 11427:2024)
Scope: This document specifies a volumetric method for the determination of silver on a material considered homogeneous. The silver content of the sample lies preferably between (100 and 999,0) parts per thousand (‰) by mass. Fineness above 999,0 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15096).
This method is intended to be used as the reference method for the determination of fineness in alloys covered by ISO 9202.
Base documents: ISO 11427:2024; EN ISO 11427:2024
ISO 6893:2024
Jewellery and precious metals — Inspection of batches of small diamonds — Terminology, classification and test methods
Scope: This document specifies the terminology, classification and test methods that are used for the inspection of batches of unmounted polished colourless diamonds with single mass smaller than or equal to 0,25 ct (carat).
While the inspection of a batch is made one diamond at a time, the use of this document is not to be claimed for one single diamond only nor for fancy coloured diamonds, nor for synthetic diamonds, nor for treated diamonds, neither for assembled stones.
Base documents:
ISO 13756:2024
Jewellery and precious metals — Determination of silver — Potentiometry using sodium chloride or potassium chloride
Scope: This document specifies a volumetric method for the determination of silver on a material considered homogeneous. The silver content of the sample lies preferably between (100 and 999,0) parts per thousand (‰) by mass. Fineness above 999,0 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15096).
This method is intended to be used as the reference method for the determination of fineness in alloys covered by ISO 9202.
Base documents:
Replaces: ISO 13756:2015
Replaced standards
ISO 13756:2015
Jewellery -- Determination of silver in silver jewellery alloys -- Volumetric (potentiometric) method using sodium chloride or potassium chloride
Scope: ISO 13756:2015 specifies a volumetric method for the determination of silver in silver jewellery alloys, preferably within the range of fineness stated in ISO 9202. These alloys may contain copper, zinc, cadmium, and palladium. Apart from palladium, which must be precipitated before commencing titration, these elements do not interfere with this method of determination.
NOTE          This method is an alternative recommended method to ISO 11427.
Base documents:
Replaced: ISO 13756:2024
EVS-EN ISO 11427:2016
Jewellery - Determination of silver in silver jewellery alloys - Volumetric (potentiometric) method using potassium bromide (ISO 11427:2014)
Scope: The method of ISO 11427:2014 describes a volumetric method for the determination of silver in jewellery alloys, preferably within the range of fineness stated in ISO 9202.
These alloys may contain copper, zinc, cadmium, and palladium. Apart from palladium, which must be precipitated before commencing titration, these elements do not interfere with this method of determination.
This method is intended to be used as the referee method for the determination of fineness in alloys covered by ISO 9202.
Base documents: ISO 11427:2014; EN ISO 11427:2016
Drafts