Petra Diamonds Limited is a United Kingdom-based independent diamond mining company and a supplier of gem quality rough diamonds to the international market. The Company's segments include Mining, Corporate and Beneficiation. Its Mining segment is engaged in the extraction and sale of rough diamonds from mining operations in South Africa and Tanzania. The Company’s portfolio incorporates interests in three underground producing mines in South Africa (Finsch, Cullinan and Koffiefontein) and one open pit mine in Tanzania (Williamson). The Cullinan mines provide gem diamonds, including Type II stones, as well as rare blue diamonds. The Finsch mines produces special diamonds and a number of +50 carat stones annually.