Koh-i-noor diamond was discovered in Indian in 1306 AD, and is kept for the public display in London. It is believed to be unlucky for all its men owners.
Why the Kohinoor diamond won't make an appearance at King Charles III's coronation
History of Kohinoor Diamond
From Crowning Queen Elizabeth II to Camilla: Journey of India's Kohinoor Diamond Taken by British in 1849 - News18
History of Kohinoor Diamond – Kohinoor Diamond of India
The Legendary Koh-i-Noor Diamond — REENA AHLUWALIA
The Kohinoor Diamond
Mountain of Light: The History and Lore of the Koh-i-Noor Diamond
The Kohinoor diamond was obtained by the British Empire. Some argue it should be returned to India.
Kohinoor to be displayed as 'symbol of conquest' in London - Rediff.com
The Koh-i-Noor Mountain of light – VOON SILVER JEWELLERY