The second largest unresolved diamond in history has been dug out of a Botswana mine by a Canadian mining company.
Lucara Diamond Corp has discovered a 1.588 carat diamond, which is larger than tennis and weighs close to 352g, just three years after making a special discovery in 2015.
The company struggled to sell the previously detected 1,109 carats "Lesedi La Rona" after failing to meet its unexposed reserve price at the June 2016 auction.
In the end, soon two years later it was bought for $ 53m from the British dealer Graff Diamonds.
According to Forbes, 67 stones were cut off from the stone.
After the latest discovery, Lucara's shares rose 11.4% to the highest in more than two months before closing 6.3%.
The stone is the second largest only on the famous Kalinan diamond of 3,106 carats, which was found near Pretoria in South Africa in 1905.
Two of the polished precious stones cut off from Kalinan – the Great Star of Africa and the Smaller Star of Africa – feature Britain's crown jewelry.
Lucara reports that Karowe has updated a number of diamonds of high value since the introduction of new technology and found 12 stones over 300 carats, including 72 carats and a 327 carat diamond in April 2018.
Eira Thomas, chief executive of the company, said: "Karoe has now produced two diamonds of more than 1,000 carats in just four years, reaffirming the tough character of the resource and the likelihood of restoring additional, large, high quality diamonds in the future."