Petra Diamonds Limited – one of the key Bourevestnik customers – has recovered its third 100+ct Type II D color gem quality diamond since March 2019, and the fourth such stone in the current financial year at its iconic Cullinan Diamond Mine.
A 100.83 ct. diamond recovered at the Cullinan Diamond Mine on March 8
th was followed by a 425.10 ct. and a 209.9 ct stone recovered on March 29 th and April 18 th respectively.
100.83 carat D Colour Type II gem quality
209.9 carat D colour Type II gem quality
425.10 carat D colour Type II gem quality
The recoveries demonstrate the prevalence of these types of stones in the Cullinan orebody and the ability of the mine's plant to recover the full spectrum of diamonds.
The Large Diamond Recovery Plant at the Cullinan Diamond Mine uses Bourevestnik X-ray luminescence sorters – 10 machines are currently in operation allowing the processing of -60mm +8mm mill-product material directly via X-ray sorters without the application of Dense Media Separation. The above Type II stones were recovered using Bourevestnik LS-20-09L high-throughput X-ray luminescence primary sorters and an LS-OD-75 X-ray luminescence reconcentration sorter.
Petra Diamonds is a leading independent diamond mining group and a consistent supplier of gem quality rough diamonds to the international market. The Company has a diversified portfolio incorporating interests in three underground producing mines in South Africa (Finsch, Cullinan and Koffiefontein) and one open pit producing mine in Tanzania (Williamson). It also maintains an exploration programme in Botswana and South Africa, which is currently under review. For further information, please visit
Bourevestnik, JSC. is one of the world’s biggest designers and manufacturers of X-ray sorters for diamond recovery and is a subsidiary of “ALROSA” (PJSC).