CN subheading 6804 23 covers grindstones, whetstones, oilstones and honing stones made of natural stone, excluding agglomerated abrasive or diamond products. Natural sharpening stones are shaped directly from quarried rock possessing inherent abrasive properties, such as novaculite (Arkansas stone), Belgian blue stone, Japanese water-stone varieties and various siliceous schists and quartzitic sandstones. These products are used for the manual or mechanical sharpening of cutting tools including kitchen knives, chisels, plane blades, axes, surgical scalpels and agricultural implements. The classification criterion distinguishing 6804 23 from 6804 21 (agglomerated diamond) and 6804 22 (other agglomerated abrasives) is the exclusive use of natural stone as the working material. Commercial documentation should clearly specify the stone variety, geological origin, grit equivalent and intended use in order to support correct tariff classification. In case of doubt, importers are advised to apply for a Binding Tariff Information ruling from the competent customs authority.

Import of natural stone sharpening and grinding products under CN 6804 23 into the European Union follows standard customs procedures. These products are not subject to mandatory CE marking as they fall outside the scope of the Construction Products Regulation and any New Approach directive. Consumer-facing products such as kitchen sharpening stone sets are subject to the General Product Safety Regulation (EU) 2023/988, which requires products to be safe and properly labelled with the producer or importer contact details. Products intended for professional trade use may need to comply with occupational risk assessment provisions under Directive 89/391/EEC. Customs declarations must include a precise product description, customs value determined in accordance with Articles 70 to 74 of the Union Customs Code, country of origin and the CN code. Preferential duty rates may apply under EU free trade agreements such as CETA, EPA with Japan or GSP arrangements, provided rules of origin requirements are met and supported by proof of origin documentation.

Natural stone grindstones and whetstones classified under CN 6804 23 serve a broad range of professional and artisan applications. In food preparation and butchery, Japanese water-stones are prized for producing exceptionally sharp cutting edges on chef knives, boning knives and cleavers. Woodworkers rely on Arkansas oilstones and Belgian stones to maintain the keen edges of chisels, plane blades and carving tools. Precision engineering and aerospace sectors use fine-grit natural honing stones to achieve ultra-low surface roughness on precision bores and valve seats. The collector and premium knife-sharpening market commands high prices for rare Japanese natural stones (tennen toishi) from Kyoto quarries with unique geological properties. Surgical and dental instrument manufacturers apply fine natural stones as a final honing stage for scalpel blades and drill tips. Importers and distributors should ensure product labelling accurately states the stone type, country of origin and grit range to facilitate both correct customs classification and end-user compliance.

Grinding stones of natural stone under CN 6804 23 carry a 0% EU duty.