ISO 9202:2026

Overview

ISO 9202:2026 – Jewellery and precious metals - Fineness of precious metal alloys is an international standard developed by ISO Technical Committee 174. This document establishes a standardized range of fineness values for precious metal alloys, such as gold, platinum, palladium, and silver, used in the jewellery industry. The standard ensures consistency in determining and declaring the fineness of jewellery alloys, facilitating international trade and consumer trust. While ISO 9202:2026 recommends recognized ranges and test methods for fineness, national regulations may also govern the designation, marking, and stamping of finished articles.

Key Topics

• Fineness Definition
  Fineness is defined as the content of the named precious metal in an alloy, expressed as parts per thousand (‰) by mass. The standard specifies acceptable minimum fineness values, prohibiting minus tolerances.

• Alloy Types Covered

  • Gold
  • Platinum
  • Palladium
  • Silver

• Authorized Analytical Methods
  The standard references internationally recognized methods for determining metal content, including gravimetry, cupellation, potentiometry, and modern spectrometric techniques such as ICP-OES and SPARK-OES.

• Minimum Fineness Ranges
  It presents a structured list of fineness values for each precious metal alloy, ensuring harmonized quality benchmarks in the jewellery sector.

• Interaction with Local Regulations
  ISO 9202:2026 acknowledges that national legislation may require additional or specific practices regarding the marking and stamping of jewellery articles.

Applications

ISO 9202:2026 plays a vital role in the global jewellery supply chain, supporting:

• Jewellery Manufacturers and Designers
  Ensures raw material selection meets recognized standards for gold, platinum, palladium, and silver content, building consumer confidence.

• Assay Offices and Testing Laboratories
  Provides guidance on standardized test methods for determining the fineness of precious metal alloys, allowing for reliable and repeatable results.

• Importers, Exporters, and Retailers
  Facilitates the smooth exchange of precious metal jewellery products by providing common benchmarks, reducing technical barriers to trade.

• Regulators and Certification Bodies
  Offers a foundation for legal and voluntary certification schemes, complementing local hallmarking laws and consumer protection initiatives.

• Consumers
  Increases transparency and assurance regarding the precious metal content of purchased jewellery, helping buyers make informed choices.

Related Standards

For accurate determination of precious metal fineness, ISO 9202:2026 references several key analytical standards, including:

• ISO 11426 – Determination of gold (cupellation/fire assay)
• ISO 11210 – Determination of platinum (gravimetry)
• ISO 11427 – Determination of silver (potentiometry)
• ISO 11490 – Determination of palladium (gravimetry)
• ISO 11494 / ISO 11495 – Determination of platinum and palladium (ICP-OES)
• ISO 15093 / ISO 15096 / ISO 18214 – Determination of high-purity precious metals (ICP-OES / SPARK-OES)
• ISO 13756 – Alternative methods for silver
• ISO 19376-1 – Vocabulary for precious metals and units

These standards support the technical accuracy and global reliability of precious metal fineness declarations in the jewellery industry.

By adopting ISO 9202:2026, organizations can ensure compliance with international best practices for precious metal alloys in jewellery, streamline quality assurance, and support global market access.