DIN Standards Committee Optics and Precision Mechanics
DIN EN ISO 11426
Jewellery - Determination of gold in gold jewellery alloys - Cupellation method (fire assay) (ISO 11426:2014, Corrected version 2014-12-15); German version EN ISO 11426:2016
Schmuck - Bestimmung von Gold in Goldschmucklegierungen - Dokimastisches Verfahren (ISO 11426:2014, korrigierte Fassung 2014-12-15); Deutsche Fassung EN ISO 11426:2016
Overview
This document specifies a cupellation method (fire assay) for the determination of gold in gold jewellery alloys. The gold content of the alloys should preferably lie between 333 and 999 parts per thousand. The procedure is applicable specifically to gold alloys incorporating silver, copper, and zinc. Some modifications are indicated where nickel and/or palladium are present in the so-called white gold alloys, as well as for alloys containing 990 or more parts per thousand of gold. This method is intended to be used as the recommended method for the determination of fineness in alloys covered by ISO 9202. This document (ISO 11426) has been prepared by Technical Committee ISO/TC 174 "Jewellery" (secretariat: DIN, Germany) of the International Organization for Standardization (ISO) and shall now be adopted as EN ISO 11426. The responsible German standardization committee is Working Committee NA 027-04-04 AA "Analysenmethoden zur Bestimmung des Feingehalts von Edelmetallen" ("Methods of analysis for determination of fineness of precious metals") at DIN Standards Committee Optics and Precision Mechanics (NAFuO).
Document: references other documents
Responsible national committee
NA 027-04-04 AA - Methods of analysis for determination of fineness of precious metals