Overview - ISO 18323:2015 (Jewellery - Consumer confidence in the diamond industry)
ISO 18323:2015 defines clear nomenclature and disclosure requirements for the diamond market to maintain consumer confidence. The standard is consumer‑focused and specifies permitted descriptors and a glossary for diamonds, treated diamonds, synthetic (laboratory‑grown) diamonds, composite stones and imitations. It clarifies terminology, grading characteristics, common treatments and disclosure obligations in commercial documents, advertising and sales.
Key topics and technical requirements
- Permitted descriptors and definitions: Clear definitions for diamond (natural), treated diamond, synthetic diamond (laboratory‑grown/created), composite stone and imitation of diamond.
- Disclosure rules: Sellers must disclose treated or synthetic stones unambiguously. Terms that mislead (e.g., “natural treated diamond”) are prohibited. Abbreviations (e.g., “lab diamond”, “syn diamond”) are not permitted for synthetic diamonds.
- Treatment identification: The standard lists treatments requiring disclosure (e.g., fracture filling, irradiation, laser drilling, HPHT, coating) and requires special care information where applicable.
- Grading characteristics: Standardizes terminology for clarity, colour, cut (shape, proportions, symmetry, polish), carat weight, fluorescence and total weight reporting.
- Commercial documentation: Defines what constitutes commercial documents (certificates, invoices, adverts, online listings) and mandates disclosure in those documents.
- Normative language: Uses ISO directive terms - “shall” (requirement), “should” (recommendation), “may” (permitted) - for compliance interpretation.
Applications and who uses ISO 18323:2015
- Jewellers and retailers - accurate labelling, in‑store and online product descriptions, customer advice.
- Gemmological laboratories and appraisers - consistent terminology and reporting when identifying natural, treated or synthetic diamonds.
- Manufacturers and diamond suppliers - product labelling, packaging and compliance with trade documentation.
- E‑commerce platforms and marketers - compliant product listings and advertising to avoid misleading consumers.
- Regulators and consumer protection bodies - benchmarking disclosure expectations and investigating misrepresentation.
- Customs and certification bodies - consistent classification in trade and certification processes.
Related standards and context
- Developed by ISO/TC 174 (Jewellery), ISO 18323 complements industry guidelines and laboratory practices by standardizing consumer‑facing nomenclature and disclosure. It aligns with broader ISO principles on normative language and documentation.
Keywords: ISO 18323:2015, diamond industry, consumer confidence, synthetic diamond, treated diamond, diamond labelling, diamond disclosure, diamond grading, diamond treatments, composite stone, imitation of diamond.
