Overview
ISO 22764:2020 is an international standard published by the International Organization for Standardization (ISO) that specifies the precious metal content in solders used in the production of jewellery made from precious metal alloys. This standard ensures the quality and fineness of solders, which are critical for maintaining the integrity, appearance, and value of precious metal jewellery including gold, platinum, palladium, and silver items.
Key Topics
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Precious Metal Content Requirements
The standard defines the minimum fineness requirements for solders compatible with various precious metal jewellery alloys:
- Gold jewellery: Solders must have fineness at least equal to the item, with specific exceptions for certain gold alloys (e.g., red gold).
- Platinum jewellery: Solders must contain at least 800‰ total precious metals.
- Palladium jewellery: Solders must contain a minimum of 700‰ total precious metals.
- Silver jewellery: Solders must have a silver fineness of at least 550‰.
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Terminology and Definitions
Key terms such as fineness (titre), precious metals, precious metal alloys, and solder are clearly defined to ensure uniform understanding and application.
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Fineness Determination Methods
The standard references precise ISO testing methods for determining the precious metal content in solders. These include gravimetric, volumetric, and spectrometric techniques detailed in related ISO standards like ISO 11210, ISO 11426, ISO 11427, and others.
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Exceptions and Specific Conditions
The standard provides exceptions for specific jewellery types such as fine gold chains under 1 mm diameter, which can use solders without gold content, ensuring practical manufacturing flexibility while maintaining quality.
Applications
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Jewellery Manufacturers
ISO 22764:2020 guides jewellery producers in selecting solders that match or exceed the precious metal fineness of their jewellery pieces, preserving product quality and precious metal value.
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Quality Assurance and Compliance
Jewellery quality control teams can apply this standard to verify solder compositions, ensuring finished items meet declared precious metal standards and consumer expectations.
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Assay Laboratories
Testing laboratories use the defined methods to accurately assess solder fineness, supporting conformity verification and certification.
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Regulatory and Consumer Protection
By standardizing solder fineness, ISO 22764:2020 helps prevent misleading practices and supports consumer confidence in precious metal jewellery.
Related Standards
ISO 22764:2020 references and complements several other ISO standards related to precious metals and jewellery alloy testing methods, including:
- ISO 11210 – Gravimetric determination of platinum content in jewellery alloys
- ISO 11426 – Fire assay method for gold content determination
- ISO 11427 – Volumetric method for silver content analysis
- ISO 11490 & ISO 11495 – Palladium content determination using gravimetric and ICP-OES methods
- ISO 13756 – Alternative volumetric methods for silver determination
- ISO 15093 & ISO 15096 – High-purity gold, platinum, palladium, and silver content determination by ICP-OES
These standards collectively establish a comprehensive framework for the precise analysis and quality management of precious metal alloys and related materials used in jewellery manufacturing.
Keywords: ISO 22764:2020, precious metals, jewellery standards, solder fineness, jewellery alloys, gold solder, platinum solder, palladium solder, silver solder, precious metal content, jewellery manufacturing, quality control, precious metal alloys testing, ISO standards for jewellery
Open preview (PDF)Jewellery and precious metals — Fineness of solders used with precious metal jewellery alloys