The blue diamond found at the Cullinan mine this month.
A rare 29.6-carat blue diamond that could be worth millions of pounds has been discovered in South Africa.
Petra Diamonds said the "exceptional" acorn-sized diamond was unearthed at the Cullinan mine near Pretoria.
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notable finds at the mine include the Cullinan Diamond in 1905,
described as the largest rough gem diamond ever recovered, at 3,106
carats;...