Dust and Powder of Natural or Synthetic Precious and Semiprecious Stones

No. The Kimberley Process applies specifically to rough natural diamonds. Diamond powder and dust — whether natural or synthetic — are not classified as rough diamonds and are therefore not subject to KP certificate requirements. However, importers should maintain documentation of origin and whether the material is natural or synthetic, as CBP may request this information.

Semiconductor wafer lapping and polishing typically require diamond powders with very tight particle-size distributions, often in the sub-micron to low-micron range, with strict limits on oversized particles that could cause surface defects. Suppliers provide powders graded by mean particle size (D50) and distribution width. These specifications are set by the end-user's process requirements and are not defined by the trade classification, but they drive supplier qualification and pricing significantly.