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South Africa’s Petra Diamonds (LON:PDL) has recovered a 342.92-carat Type IIa white rough at its iconic Cullinan mine.

The company said the diamond is “exceptional” quality, in terms of both its colour and clarity,  and that it will likely be sold at the September tender.

Petra fetched in March $12.2 million for a 299.3-carat Type IIA white diamond. That meant it obtained $40,701 per carat, which exceeds the $34,386/ct received for the 424.89-carat “Legacy of the Cullinan Diamond Mine” in May 2019. 

Type II diamonds are found less frequently and are more valuable than Type I diamonds, as they have no measurable nitrogen impurities. This gives them exceptional transparency and brilliance.

Cullinan is known as the birthplace of the famed 3,106-carat Cullinan diamond, which was cut to form the 530-carat Great Star of Africa.

The operation also yielded the 317-carat Second Star of Africa.

They are the two largest diamonds in the British Crown Jewels.

Cullinan is known as the world’s most important source of blue diamonds, such as the 39.34-carat stone Petra found in April and which sold for $40.2 million earlier this month. It was the company’s highest price ever for a single stone.