Rare Blue Diamond found in South Africa's Cullinan mine

The 29.6-carat stone was recovered by Petra Diamonds at its Cullinan mine, about 40km (25 miles) north-east of Pretoria. Petra unearthed a 25.5 carat blue diamond which sold for $16.9m (£10.3m) in 2013. via Pocket http://ift.tt/1f4At0u