Multiple web search results confirm that New York Mayor Zohran Mamdani made remarks suggesting King Charles should return the Koh-i-Noor diamond to India. The sources frame this as a hypothetical conversation or a general statement regarding the diamond's return.

Web search results confirm the diamond has been in Britain since 1849 and that its ownership is a subject of historical and international dispute, though they do not specify 'several countries' in a single source.

Multiple web search results confirm that Mayor Zohran Mamdani called for King Charles to return the Koh-i-Noor diamond, specifying that the British Empire took it from the Indian subcontinent in the 1800s. The timing (on the third day of the state visit) is mentioned in one source, but the core claims are corroborated by multiple independent reports.

Web search results confirm the diamond is housed in the Tower of London, is a massive stone, and is set in the Crown of Queen Elizabeth the Queen Mother. However, one source cites a weight of 106 carats, while others cite 105.6 carats, making the specific weight slightly disputed, but the general facts are corroborated.

Web search results confirm the diamond's ownership passed through Mughal emperors, Iranian shahs, and Sikh maharajas, and that the Kingdom of Punjab gave it to Queen Victoria in 1849 as part of a peace treaty. This sequence of historical ownership is consistently reported across the available web search results.

Multiple web search results confirm the diamond was mined in India and that several countries, including Afghanistan, Iran, and Pakistan, have laid claim to its ownership, indicating a widely debated history.