Senators Elizabeth Warren and Richard Blumenthal are seeking answers from the Antwerp World Diamond Centre and jeweler David Gotlib over an 18-carat gold ring set with 321 diamonds that was presented on June 28 for U.S. President Donald Trump at an America 250 celebration in Brussels, 26 days before the administration exempted European natural diamonds from new Section 301 tariffs on July 24. Antwerp's diamond sector has now rejected any link between the gift and the tariff decision, saying the ring was created for the official celebration of 250 years of American independence organized by the U.S. Embassy in Belgium and that its lobbying to restore a 0% tariff was entirely separate. The senators said the timing raises questions under federal bribery law and asked both AWDC and David Gotlib Luxury Cufflinks for details. The White House has denied granting favors to special interests and said the ring is federal property unless Trump pays the government market value to keep it.