“To date, we are not aware of any public reporting indicating the current location of the ring,” Warren and Blumenthal wrote in the letter, first reported by Newsweek. The AWDC, which represents the diamond trading industry in Antwerp, Belgium, delivered the ring to the U.S. ambassador to Belgium, Bill White, a few weeks before the White House announced that European diamonds would be exempt from tariffs.

Warren and Blumenthal said when they asked the AWDC if the gift was a bribe to Trump, they were told it was a gift to the American people, not the president. The organization denied any connection between the tariff exemption and the ring, estimated to be worth close to $30,000, in a statement in August.

“The discussion about U.S. import ‌tariffs was entirely separate from [the gifted ‌ring],” the organization said.