Petra Diamonds (LON:PDL) has done it again - this time unearthing an "exceptional" 232.08 carat white diamond from the famous Cullinan mine in South Africa.
The stone is a "D colour Type II diamond", according to Petra, and is a magnificent example of the high quality diamonds for which the mine is known.
The mine has produced just under 800 stones weighing more than 100 carats, over 130 stones weighing more than 200 carats, and around a quarter of all diamonds weighing more than 400 carats.
In June this year, the firm uncovered an exceptional blue diamond - at a whopping 122.52 carats from the mine, which lies in the foothills of the Magaliesberg mountain range - 37km north-east of Pretoria.
Meanwhile, in February, a 29.6 carat diamond was sold for US$25.6 million, while a 25.5 carat diamond sold for US$16.9 million last year.
It was from Cullinan that the largest rough gem diamond ever found, at 3,106 carats, was uncovered in 1905.
The stone was cut into the two most important diamonds, which today form part of the Crown Jewels in the Tower of London.