A number of mixed reactions, were observed. They were mostly based on no understanding of politics, nor of the history, of the diamond.
From curses to conflicts: What will happen to Queen Elizabeth's Crown Jewels?, International
I found this an informative photo of the British Imperial State Crown : r/coolguides
Not just Kohinoor, these precious items were also taken away by Britain
Curse of the Koh-I-Noor Diamond
The mystery of King Charles' missing diamond – POLITICO
Koh-i-noor, Diamond, Controversy, & Facts
The Kohinoor diamond was obtained by the British Empire. Some argue it should be returned to India.
Where are the jewels in King Charles's crown from
Kohinoor—a 'gift' to the British, but only God or a woman can wear it with impunity - The American Bazaar
Who Really Owns the Koh-i-Noor Diamond? ~ Part I [OP-ED]
Kohinoor To Be Cast As Symbol Of Conquest In New Tower of London Display
The True Story of the Koh-i-Noor Diamond—and Why the British Won't Give It Back, History
History of Kohinoor Diamond
The Kohinoor 'curse' and other unknown stories about the British crown jewel
The Koh-i-Noor and Cullinan diamonds: Crown jewels have fraught history - The Washington Post