This document amends the U.S. Customs and Border Protection (CBP) regulations to set forth the prohibitions and conditions that are applicable to the importation and exportation of rough diamonds pursuant to the Clean Diamond Trade Act, as implemented by the President in Executive Order 13312 dated July 29, 2003, and the Rough Diamonds Control Regulations (RDCR) issued by the Office of Foreign Assets Control of the U.S. Department of the Treasury. In addition to restating pertinent provisions of the RDCR, the amendments clarify that any U.S. person exporting from, or importing to, the United States a shipment of rough diamonds must retain for a period of at least five years a copy of the Kimberley Process Certificate that currently must accompany such shipments and make the copy available for inspection when requested by CBP. The document also requires formal entry for shipments of rough diamonds.