The royal visit, which included meetings with US President Donald Trump, has been widely viewed as part of efforts to strengthen diplomatic relations between the United States and the United Kingdom, alongside commemorations tied to the 250th anniversary of American independence. Images of cordial exchanges between King Charles III and President Trump also circulated widely on social media.
The remark that sparked controversy
During a press interaction on Wednesday, Mamdani was asked what he might say to King Charles III ahead of a scheduled meeting. His response quickly drew attention:
“If I was to speak to the King separately from that, I would probably encourage him to return the Kohinoor diamond.”
The comment was met with mixed reactions in the room, with some attendees reacting lightly, but it soon escalated into a broader online debate once clips circulated on social media platforms.
Social media reactions divided
The statement triggered sharply contrasting responses online. Many users of Indian origin praised the remark, viewing it as a bold reference to long-standing historical grievances related to colonial-era artifacts.
However, others—particularly in the United States—criticized the comment, questioning its relevance in a diplomatic or civic context. Some social media posts suggested the focus should remain on domestic issues rather than historical restitution debates, while others accused Mamdani of prioritizing foreign matters.
The Kohinoor diamond and its disputed history
The discussion centers around the Koh-i-Noor Diamond, a 105.6-carat gemstone with a complex and contested history. It was surrendered in 1849 to the British East India Company by the young Maharaja Duleep Singh following the annexation of the Sikh Empire.
The diamond later became part of the British Crown Jewels and was worn by Queen Victoria in the 19th century. Today, it is displayed at the Tower of London under the care of Historic Royal Palaces.
India has periodically raised claims for the diamond’s return, arguing that it was taken under colonial conditions. The United Kingdom has consistently maintained that the diamond was acquired legally under the laws of the time, while also acknowledging its complex historical legacy.
Ongoing debate over cultural restitution
The incident has once again highlighted broader global debates over the repatriation of cultural artifacts taken during colonial rule. While supporters of restitution see such moves as symbolic justice, critics argue they open difficult questions about historical ownership and international museum collections.
As of now, there has been no confirmation that the topic was discussed during Mamdani’s meeting with King Charles III at the 9/11 Memorial event later that day.
