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

India using Koh-i-Noor diamond as 'political gimmick' and don't want it back, family claims

Koh-i-Noor - Wikipedia

DIAMOND Introduction - Issuu

Return Kohinoor to India', demands petition; says 'no longer morally defensible for UK' - BusinessToday