Financial Express | Kohinoor diamond: 6 facts about bone of contention between India & British governments Financial Express 6. In 1849, the British conquered Punjab and the Lahore treaty was proclaimed. One term in the treaty stated that: The gem called Kohinoor which was taken from Shah Shuja-ul-Malik by Maharaja Ranjit Singh shall be surrendered by the Maharajah of Lahore ... |