In which one of the following districts, have large reserves of diamond-bearing kimberlite been discovered in the recent past?

In Raipur large reserves of diamond-bearing kimberlite been discovered in the recent past. Diamonds in Chattisgarh region of Madhya Pradesh. The presence of pyrope, ilmenite and chromediopside in the Payalikhand gravel has provided positive evidence for the close proximity of diamond bearing kimberlite or lamproite rocks in the area.