New York Mayor Zohran Mamdani indicated he would urge King Charles III to return the Koh-i-Noor diamond during the monarch's visit to the city. The suggestion came as the King and Queen Camilla attended engagements, including a visit to the National 9/11 Memorial & Museum. The Koh-i-Noor, a disputed colonial-era artifact, has been a point of contention for centuries.