The Kohinoor diamond was obtained by the British Empire. Some argue it should be returned to India.

quot;It has a history of being part of war booty or trophies taken as the result of war in South Asia. So in a lot of ways, it is a symbol of plunder and represents the long history of plunder imperialism,” a history professor said.
After the death of Queen Elizabeth II last week, online users are calling for the British government to surrender artifacts obtained by the British Empire,
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Where does the Koh-i-Noor diamond belong to? - Quora

Former British Colonies Demand $400 Million Crown Jewel Be Returned

Camilla's crown won't have the Kohinoor, but it will have fragments of an African diamond that could be just as controversial - ABC News

India says Koh-i-Noor diamond's use could bring back 'painful memories' of British colonialism

Pakistan and India demand the return of the Koh-i-Noor Crown Jewel

Curse of the Koh-I-Noor Diamond

Camilla's crown won't have the Kohinoor, but it will have fragments of an African diamond that could be just as controversial - ABC News

Koh-i-Noor diamond was not stolen by British colonial rulers after all, Indian government says, The Independent

Koh-i-Noor diamond,186 carats,re-cut oval stellar brilliant,108.93 carats,part of the British Crown Jewels

Koh-i-Noor: The History Of The Desired, Stolen And Cursed Diamond

Pakistan should get back the Kohinoor diamond from UK, petitions lawyer - The American Bazaar

Koh-i-Noor - Wikipedia