Nonindustrial Diamonds, Worked (Polished or Drilled)

Polished, drilled, and otherwise worked gem-quality diamonds — the finished loose stones that feed the jewelry and investment markets — are split at the US 10-digit level by carat weight: stones of 0.5 carats or less (7102390010) and stones exceeding 0.5 carats (7102390050), a distinction that reflects significant differences in per-unit value and customs valuation scrutiny. India dominates US imports under this heading, driven by Surat's position as the world's largest diamond polishing center; Belgium and Israel are also major sources. The weight-based split means that mixed parcels containing stones both above and below the 0.5-carat threshold must be separated and declared on distinct tariff lines. High-value individual stones may attract enhanced CBP appraisement review.

AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.