A 34.37-carat diamond has been found during NDMC's mining operations in Madhya Pradesh's Panna district, officials said.
"This was the biggest diamond found at Asia's single mechanised diamond mines in Panna operated by National Mineral Development Corporation's yesterday," Panna NDMC Project Manager C E Kindo told PTI.
Kindo said NMDC had earlier found a 32-carat diamond in the Panna mine and was auctioned for Rs 95 lakh.
"That 32-carat diamond was not as clean as this one," Kindo said.
The price of this diamond will be worked out at the Mumbai commercial office, he said.
The exploration work of NMDC has re-started in Panna 10 months ago. NMDC is engaged in diamond mining since 1965 in Panna.