19 U.S.C. § 3903: Measures for the importation and exportation of rough diamonds

The President shall prohibit the importation into, or exportation from, the United States of any rough diamond, from whatever source, that has not been controlled through the Kimberley Process Certification Scheme. the President determines and reports to the appropriate congressional committees that such country is taking effective steps to implement the Kimberley Process Certification Scheme; or the President determines that the waiver is in the national interests of the United States, and reports such determination to the appropriate congressional committees, together with the reasons therefor.