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US customs country-of-mining rules — declaring diamond origin
USLast updated · 15 June 2026
Compliance information, not legal advice — verify with the relevant authority.
US Customs and Border Protection (CBP) requires importers of diamonds to declare the country of mining — not just the country of last substantial transformation. Under the Russian-diamond import ban, "substantial transformation" no longer launders origin: a stone mined in Russia and cut in India is still banned.
Importers must exercise reasonable care: you are expected to have documentation supporting the declared mining origin, and CBP can demand it post-entry. Self-certification without records is a compliance risk, not a safe harbor.
Step-by-step checklist
Tick items as you prepare the shipment — progress is not saved.
Required documents
- Entry documentation with country-of-mining declaration
- Supplier origin attestation per invoice
- Commercial invoice and packing list
- KP certificate (rough imports)
- OFAC screening record for the counterparty