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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Can we claim our Kohinoor diamond back from England? - Quora

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

The Kohinoor diamond and its rich history - Times of India

Koh-i-Noor - Wikipedia

KOHINOOR

Why is the world fighting over Queen Elizabeth's royal jewels? From Koh-i-noor on queen mother's crown to South Africa's Cullinan diamonds on the Sovereign's Sceptre and Imperial State Crown …

Whose diamond is it anyway? All you need to know about the Kohinoor and its ownership – Firstpost

With Queen's death, Twitterati wants Kohinoor's return to India - Rediff.com

India to push for UK to hand over Koh-i-Noor diamond as part of 'colonial reckoning' - LBC

The History of the Koh-i-Noor Diamond

Diamonds Are Forever: India and the UK Revisit the Koh-i-Noor Diamond – The Diplomat