British Standards Institution

Source:: ISO
Committee:: STI/53 - Specifications and test methods for jewellery and horology
Categories:: Information management | Standardization. General rules
Comment period start date:: 06/12/2024
Comment period end date:: 28/01/2025

Comment by:

28th Jan

Scope

This document describes an analytical method for the determination of gold in jewellery alloys with a nominal content of up to 990 ‰ (per mil), including alloys according to DIN EN ISO 9202 using inductively coupled plasma emission spectrometry. Preferentially the gold content of the alloys lies between 50 ‰ (parts per thousand) and 990 ‰ gold.

Purpose

Gold in jewellery alloys is typically performed in the precious metal industry by Cupellation method (fire assay). This method allows to determine all elements in a precious metal alloy with one method at the same time and is less influenced by other elements

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Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal

Proposal start date:

06/12/2024

Proposal end date:

28/01/2025

2. Draft

3. Public Comments

4. Comment Resolution

5. Approval

6. Publication

Learn more about the standards development process

Standards Development

ISO/NP 25644 Jewellery and precious metals — Determination of gold — ICP-OES method using an internal standard element

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