Overview
ISO 8654:2018/Amd 1:2019 is an amendment to the international standard that defines and specifies the colours of gold alloys used in jewellery. This document, developed by the ISO Technical Committee ISO/TC 174 on jewellery, precious metals and related products, provides updated guidance on the measurement, classification, and designation of gold alloy colours. The amendment introduces provisions related to colour measurement with a 10° standard observer, expanding the existing 2° observer framework for enhanced industry applicability.
This standard ensures consistent colour identification and quality control in gold jewellery manufacturing, facilitating clear communication among manufacturers, designers, and customers regarding the exact hue and shade of gold alloy products. It is essential for the jewellery industry to maintain uniformity in colour classification, improve product traceability, and support compliance with international regulations.
Key Topics
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Definition of Gold Alloy Colours
The standard defines the precise colour characteristics of gold alloys through chromatic coordinate systems to standardize their appearance.
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Colour Measurement Protocols
Introduces dual observer angle references for spectrophotometric assessment of gold alloy colours:
- 2° standard observer (original method)
- 10° standard observer (newly added in Amendment 1), reflecting broader industry usage
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Spectrophotometer Settings and Methods
Detailed guidance on configuring spectrophotometers for accurate colour measurement using the 10° observer, including calibration and measurement parameters.
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Nominal Values and Tolerances
Tables with trichromatic values and tolerances for different gold colours expressed in xyY, Lab*, and LCh coordinate systems, allowing precise reproducibility and acceptance criteria.
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Graphical Illustrations
Visual figures represent colour tolerances and ranges for quick reference in quality control and design evaluation.
Applications
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Jewellery Manufacturing
Enables manufacturers to produce gold alloy items with reliably measured and designated colours, ensuring product consistency.
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Quality Assurance
Assists quality control labs in verifying compliance with defined colour standards, supporting product certification processes.
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Design and Development
Designers use standard colour definitions to specify exact gold alloy hues in product development, enhancing customer satisfaction.
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Trade and Commerce
Standardized gold alloy colour designations facilitate clear communication in international markets, reducing disputes and misunderstandings related to product appearance.
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Consumer Transparency
Provides clear information on the colour characteristics of gold jewellery, improving buyer confidence.
Related Standards
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ISO 6507 – Metallic Materials – Vickers Hardness Test
May be used in conjunction with ISO 8654 for comprehensive material evaluation.
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ISO 9204 – Jewellery and Precious Metals – Sampling Methods
Relevant for ensuring that samples for colour measurements are taken consistently.
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ISO 12312 – Jewellery and Watch Parts – Terminology and Classification
Supports unified terminology when describing jewellery materials including gold alloys.
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ISO/TR 16474 – Jewellery – Gold and Gold Alloys – Determination of Gold Content
Complementary standard for assessing gold purity alongside colour specification.
By adhering to ISO 8654:2018/Amd 1:2019, jewellery professionals achieve standardized colour classification of gold alloys, promoting uniform quality, facilitating global trade, and supporting innovation in jewellery design and manufacturing. This amendment’s inclusion of a 10° standard observer reflects evolving industry practices, making colour measurement more versatile and aligned with current technological advancements.
Open preview (PDF)Jewellery — Colours of gold alloys — Definition, range of colours and designation — Amendment 1