The Kohinoor diamond was obtained by the British Empire. Some argue it should be returned to India.
The True Story of the Koh-i-Noor Diamond—and Why the British Won't Give It Back, History
Koh-i-Noor - Wikipedia
The Kohinoor 'curse' and other unknown stories about the British crown jewel
Kohinoor Diamond of India – History, Value and Facts
The Kohinoor 'curse' and other unknown stories about the British crown jewel
Romancing the Stone: Victoria, Albert, and the Koh-i-Noor Diamond – W86th
The Kohinoor 'curse' and other unknown stories about the British crown jewel
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 …