19 U.S. Code § 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 may waive the requirements set forth in subsection (a) with respect to a particular country for periods of not more than 1 year each, if, with respect to each such waiver—
(1) 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
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