A fabulous blue diamond worth tens of millions of euros has been discovered at a South African mine.<br /><br />The acorn-sized diamond, whose colour makes it one of the rarest in the world, was unearthed at the Cullinan mine near Pretoria <br /><br />Another blue diamond, weighing 25.5 carats, found at the same mine last year sold for around 11 million euros.<br /><br />This one is expected to go for far more.<br /><br />The largest ever diamond was found in the Cullinan mine in 1905 which was eventually cut up and used in the British Crown Jewels.
