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US customs country-of-mining rules — declaring diamond origin
USLast updated · 15 June 2026
Compliance information, not legal advice. Verify requirements with the relevant authority.
U.S. Customs and Border Protection (CBP) requires diamond importers to declare the country of mining, not only the country of last substantial transformation. Under the Russian-diamond import ban, substantial transformation does not override mining origin. A stone mined in Russia and cut in India is still banned.
Importers must exercise reasonable care. They are expected to keep documentation supporting the declared mining origin, and CBP can request that documentation after entry. Self-certification without supporting 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 a country-of-mining declaration
- Supplier origin attestation for each invoice
- Commercial invoice and packing list
- KP certificate, if importing rough diamonds
- OFAC screening record for each counterparty