According to Daily News and Analysis, Rio Tinto has received approvals-in-principle from the Ministry of Mines to begin diamond mining operations in the state of Madhya Pradesh. Rio Tinto’s maiden venture in India — in the form of a diamond mine — will come up in the Bunder region of the state where the company had established a diamond prospect way back in 2004.
See http://www.mining.com/2012/01/06/rio-tinto-makes-diamond-foray-in-india/.