Petra Diamonds Ltd. engages in diamond mining and supplies rough diamond to the international market. The company holds interest in diamond mines, including Finsch, Cullinan, Koffiefontein, Kimberley Underground, Helam and Williamson. It operates through two segments: Mining and Exploration. The Mining segment engages in the extraction and sale of rough diamonds from mining operations in South Africa and Tanzania. The Exploration segment consists of exploration activities in Botswana. Petra Diamonds was founded by Adonis Pouroulis in March 25, 1997 and is headquartered in St. Helier, Jersey.