Generally, gold coins, medals, and bullion are allowed to be imported to the U.S. However if they originate from Cuba, Iran, or Sudan, under regulations from the Office of Foreign Assets Control, they are not allowed into the U.S.
Copies of gold coins are not allowed to be imported unless they are properly marked by the country that issued them. Importation of any counterfeit coins is prohibited.
Duty Rate on Gold Coins, Medals, and Bullion
There is no duty rate on gold coins, medals, or bullion, but these items must be declared to a Customs and Border Patrol (CBP) Officer. If your import is over $10,000 in value, you must file a FinCEN 105 form at the time of entry. This includes all currency valued over $10,000. “Currency” in this case, refers to coin and paper money of the United States or any other country that is (1) designated as legal tender, (2) circulates and (3) is accepted as a medium of exchange in the country it was issued in.
Head to the Harmonized Tariff Schedule to find Harmonized Tariff codes and duty rates for your products.