The Canadian miner said it wasn’t aware of any "material change" that would account for the sharp price rise in its stock on Thursday and into early trading on Friday.
Europe's second-largest copper producer also posted its best quarterly results in the last three years, with revenue rising by PLN 1.2 billion (about $312 million).
The new vessel is expected to add about 500,000 carat a year of production capacity to Debmarine Namibia, a 50/50 joint venture between De Beers and the African nation's government.
Ivanhoe can now finance Kakula and Kipushi mine to commercial production, and significantly advance, or achieve, production at the company’s Platreef Project in South Africa.
Moves gives Aussie miner access to the Moose River gold complex in Nova Scotia, Canada, which comprises one producing open-pit and three other development projects.
No decision will be made until the end of 2020, when the company expects to have completed a study on the Jadar, which is estimated to contain 10% of the world's lithium reserves.
The exceptional D colour Type IIa gem was recovered in March from the company’s iconic Cullinan mine, the same that yielded the biggest diamond ever in 1905.
ASIC has for months been probing how Merlin Diamonds has loaned A$13 million of investor money to a private company, AXIS Consultants, which has long been associated with the miner's chairman and his family.