KS Standards (Hangul: 한국산업표준) is the abbreviated form of the Korean Industrial Standards, the national standardisation system administered by the Korean Agency for Technology and Standards (KATS) under the Ministry of Trade, Industry and Energy of the Republic of Korea. The system covers all major sectors of Korean industry, with a series of designated KS standards relevant to the jewellery and precious metal trade.

Structure

Korean Industrial Standards are grouped by sector, with the prefix KS followed by a sector letter. KS D covers metallurgical materials, including the gold-, silver- and platinum-alloy compositions used in jewellery and dentistry. KS H covers food and consumer goods, with overlap into surface plating standards. Compliance with a KS designation is voluntary unless tied to a specific regulatory regime, but is widely required by Korean public procurement and by major domestic brands.

Application to jewellery

For jewellery, the most relevant standards concern fineness marking and alloy composition for gold (24K, 18K, 14K), silver (925 and other purities), and platinum, alongside related standards for plating thickness on lower-cost jewellery. Korean hallmarking is administered through the Korea Institute of Geo-Mineral Energy and Resources (KIGAM) testing programme; KS designations underlie the fineness specifications enforced through this system.

The Korean retail trade also follows a domestic gemstone identification standard maintained by Korean laboratories, including the Korean Gemological Institute. While these laboratory practices are aligned with international standards (CIBJO Blue Books, ISO terminology), the formal KS series provides the backbone for official documentation.

International correspondence

Korean precious metal alloy standards correspond closely to ISO 9202 (jewellery fineness) and ISO 8654 (gold alloy colour designation), and to JIS (Japanese) standards in the precious metal sector. Korean retail and export goods bound for jurisdictions with their own statutory hallmarking (the United Kingdom, India, France) must additionally satisfy local requirements, but a stone or item certified to KS will generally meet ISO equivalents.

Practical relevance

For Western dealers handling goods of Korean manufacture or transacting with Korean trading partners, the KS designation is functionally similar to a CE mark in the European context: an indicator of compliance with national specification rather than a separate quality grading. Korean-manufactured findings, settings and casting alloys often carry the KS reference on technical data sheets, and Korean manufacturers will confirm KS compliance on request.