CPV code 14521210 designates Dust or powder of semi-precious stones in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
14521210 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 14521200 (Semi-precious stones).