New York Mayor Zohran Mamdani asked King Charles III to return the Koh-i-Noor diamond to India during the monarch's state visit to the U.S.

The request highlights a long-standing diplomatic tension regarding colonial-era acquisitions and the legal ownership of cultural artifacts taken by the British Empire.

Mamdani made the public request on Wednesday, April 29, 2026 [1]. The call for restitution occurred in New York shortly before the mayor met with the king at the 9/11 Memorial [2].

The Koh-i-Noor is a 105.6-carat diamond [3]. It was taken from India by the British Empire during the 19th century, a period of colonial rule that has led to repeated demands from the Indian government for the stone's return [4].

Reports indicate that Mamdani said the king should "return" the diamond [5]. This action aligns with a broader global movement urging former colonial powers to repatriate looted art, and jewelry to their countries of origin.

While the British monarchy has historically resisted such requests, the public nature of the demand during a high-profile diplomatic visit puts the issue back into the international spotlight. The meeting at the 9/11 Memorial served as the backdrop for this diplomatic friction, contrasting a site of remembrance with a dispute over imperial legacy.

Zohran Mamdani called on the king to "return" the diamond

The intervention by a major U.S. city's mayor adds a layer of municipal diplomatic pressure to a bilateral dispute between the UK and India. By leveraging a state visit, Mamdani is framing the restitution of the Koh-i-Noor not merely as a legal matter, but as a moral imperative of the modern era, potentially encouraging other local leaders to weigh in on international cultural disputes.