Jan 22, 2014 23:23 Rare blue diamond found in South Africa Rare blue diamond found in South Africa AP photo provided by Petra DiamondsA 29.6-carat blue diamond was recovered earlier in January at the Cullinan Diamond Mine near Pretoria, South Africa. the associated press Jan. 22, 2014 Comments JOHANNESBURG (AP) — A mining company says it has found a rare blue diamond in South Africa. Petra Diamonds says the 29.6-carat diamond came from the Cullinan mine, source of some of the world’s most famous diamonds. Cullinan lies near Pretoria, the South African capital. Petra Diamonds said in a statement Tuesday that the diamond is a vivid blue with extraordinary tone and clarity, and could yield a polished stone of great value. The Cullinan mine yielded the 530-carat Star of Africa blue diamond that is part of the British crown jewels.