Petra gets $26m for its South African 29.6-carat blue diamond

[caption id="attachment_771508" align="aligncenter" width="600"] CEO Johan Dippenaar holding the exceptional 29.6-carat blue diamond recovered in January 2014.[/caption] Petra Diamonds (LON:PDL) has hit the jackpot twice this year, going from finding a spectacular 29.6-carat blue diamond at its Cullinan mine in...