The 2009 revision of China's national standard GB 11887 — formally titled Regulations for the Naming of Jewellery and Precious Metals — established binding requirements for the marking, fineness, and identification of precious-metal jewellery sold within the People's Republic of China. For 18-carat gold specifically, the standard codified a minimum fineness of 750 parts per thousand (75.0% pure gold by mass), brought Chinese practice into closer alignment with international norms such as ISO 9202, and introduced tighter tolerances that significantly strengthened consumer protection in a market that had, by the late 2000s, become the largest gold jewellery market in the world by volume.

Background: GB 11887 and Its Earlier Iterations

China's precious-metal jewellery standards have their legislative roots in the economic liberalisation of the 1980s, when a rapidly expanding domestic retail sector created urgent demand for enforceable quality benchmarks. The original GB 11887 standard was issued in 1989 and revised incrementally over the following two decades. By the mid-2000s, explosive growth in both domestic manufacturing and retail — driven by rising middle-class incomes, the expansion of branded jewellery chains, and China's deepening integration into global supply chains — had exposed limitations in the existing framework. Inconsistent marking practices, variable tolerance enforcement, and the proliferation of imported jewellery from jurisdictions with differing hallmarking conventions all pointed to the need for a comprehensive revision.

The 2009 revision was overseen by the Standardization Administration of China (SAC), the national body responsible for issuing mandatory and recommended standards across all industries. SAC coordinated input from the China Gold Association, accredited testing laboratories, and representatives of the retail jewellery sector before publishing the updated standard, which came into force and was enforced through market surveillance mechanisms administered at both national and provincial levels.

Key Provisions for 18-Carat Gold

Under the 2009 revision, 18-carat gold jewellery sold in China must meet the following principal requirements:

• Minimum fineness: 750‰ (750 parts per thousand, equivalent to 75.0% gold). This aligns with the international definition of 18-carat gold as used in European hallmarking conventions and ISO 9202.
• Mandatory marking: Each article must bear a stamp indicating the metal type and fineness. For 18-carat gold, the accepted marks are 18K, 750, or G750, applied directly to the piece in a legible and durable manner.
• Manufacturer or retailer identification: A registered trademark or manufacturer's code must accompany the fineness mark, enabling traceability through the supply chain and providing a basis for consumer redress.
• Tolerance provisions: The 2009 revision tightened the permissible negative tolerance on fineness, reducing the margin by which an article may fall below its declared purity. This was among the most consequential changes for trade practice, as it required manufacturers to exercise greater precision in alloy preparation and quality control.
• Alloy designations: The standard recognises common 18-carat alloy colours — yellow, white, and rose gold — without prescribing specific alloying elements, provided the minimum gold content is met. White gold articles are not required to be rhodium-plated under the standard, though plating is common commercial practice.

Alignment with International Norms

One of the stated objectives of the 2009 revision was to harmonise Chinese precious-metal standards with internationally recognised frameworks. ISO 9202 (Jewellery — Fineness of precious metal alloys) defines 18-carat gold at 750‰, and the Vienna Convention on the Control of Articles of Precious Metals (the Common Control Mark system used across much of Europe) applies the same threshold. By anchoring GB 11887 to the 750‰ figure and adopting compatible marking conventions, China facilitated smoother cross-border trade: imported jewellery bearing European or other internationally recognised hallmarks could more readily be assessed for compliance, and Chinese-manufactured goods destined for export could be produced to a single standard satisfying both domestic and foreign requirements.

This harmonisation was commercially significant. By 2009, China had become both the world's largest gold producer and one of its largest consumers, with domestic jewellery demand — particularly for 18-carat and 24-carat pieces — growing at rates that outpaced most other major markets. Standardised, enforceable marking requirements reduced barriers to entry for international brands establishing retail operations in China, while simultaneously providing domestic manufacturers with a clear quality benchmark against which to compete.

Enforcement and Testing

Compliance with GB 11887 is enforced through a layered system of market surveillance. The SAC sets the standard; enforcement is carried out by the State Administration for Market Regulation (SAMR) and its provincial counterparts, which conduct periodic inspections of retail jewellery, commission testing by accredited laboratories, and impose penalties for non-compliance. Accredited testing bodies — including facilities operated under the China National Accreditation Service for Conformity Assessment (CNAS) framework — use X-ray fluorescence (XRF) spectrometry and, where required, fire assay as the definitive analytical method for fineness verification.

The tightened tolerances introduced in 2009 placed greater demands on laboratory precision as well as on manufacturing quality control. Fire assay, which involves cupellation and gravimetric analysis, remains the referee method for disputed results, consistent with international laboratory practice.

Market Context and Consumer Impact

The 2009 revision coincided with a period of rapid professionalisation in China's jewellery retail sector. Major domestic chains — including Chow Tai Fook, Luk Fook, and Chow Sang Sang, which operate extensively in mainland China — had already adopted rigorous internal quality standards, and the revised GB 11887 effectively raised the floor for the broader market. Smaller manufacturers and informal retailers were compelled to invest in better alloy management and marking equipment or risk sanctions during market surveillance sweeps.

For consumers, the practical effect was greater confidence that a piece marked 18K or 750 in a Chinese retail environment genuinely contained at least 75.0% gold. This was not a trivial assurance in a market where, prior to tighter enforcement, substandard goods had occasionally been documented by consumer protection authorities. The requirement for manufacturer identification further enabled consumers and regulators to trace non-compliant goods back through the supply chain.

Subsequent Developments

GB 11887 has continued to be reviewed and updated since 2009, with later revisions addressing topics such as the naming conventions for platinum-group metals, the treatment of composite and plated articles, and the growing commercial importance of palladium alloys. The 2009 revision nonetheless represents a watershed moment in the standard's history, establishing the foundational framework for fineness and marking requirements that subsequent revisions have refined rather than replaced. It remains the basis on which 18-carat gold jewellery is regulated in China today.

Further Reading

• GIA Gems & Gemology — Gold Jewellery in China (gia.edu)
• ISO 9202: Jewellery — Fineness of precious metal alloys (iso.org)