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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Desired, stolen or cursed: The history of the Koh-i-Noor

The True Story of the Koh-i-Noor Diamond—and Why the British Won't Give It Back, History

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

India sues the Queen for return of 'stolen' £100m Koh-i-Noor diamond : r/worldnews

The mystery of King Charles' missing diamond – POLITICO

Britain, India and the Koh-i-Noor diamond – don't expect the jewel to be prised out of the crown

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

Queen Elizabeth II's Death: Voices strengthen demanding return of Kohinoor; Here's how it reached London - Lifestyle News

With passing away of Queen Elizabeth II, twitterati demands Kohinoor's return to India : The Tribune India

Koh-i-Noor - Wikipedia

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

Why is Kohinoor So Special? The Epic Journey of the Kohinoor Diamond

As Queen departs, Twitterati now demands Kohinoor's return to India