The price of a small rough diamond has increased almost 20 percent since March.
The European Union is considering the ban in response to the war in Ukraine.
Suleiman Kerimov is said to be the owner of the $325 million “Amadea.”
Serena Williams and Lewis Hamilton Are Joining a Bid to Buy the Chelsea Football Club From Roman Abramovich
The tennis and racing legends have joined a group led by Martin Broughton.
“Amadea” is widely believed to be owned by sanctioned Russian billionaire Suleiman Kerimov.
The Château de la Croë once belonged to the former King of England Edward VIII and American socialite Wallis Simpson.
Asset-recovery specialists are equal parts Perry Mason, Nancy Drew and James Bond. Their speciality is finding the things owners would rather keep to themselves.
The Justice Department cited bank fraud, money laundering and sanctions violations as justification for the seizure.
The move has been labeled “a clear and stark warning to Putin and his cronies.”