Reuters reports that Lucara, which failed to sell the world's largest uncut stone at Sotheby's auction house last year, continued to receive offers.
"If that doesn't pan out ... within the next six to eight weeks we will most fully look to enter into a partnership," company chief executive William Lamb was quoted as saying.
"I think we've got to. It's been almost two years since we recovered the stone and the market is, I think, chomping at the bit, waiting to see what the outcome from that is going to be."
Reuters reported last month that Lucara would need a partner in order to cut and sell the rough diamond.
"I think people don't really understand the quantum of money we're looking at," said Lamb.
Mathew Nyaungwa, Editor in Chief of the African Bureau, Rough&Polished