This week started with reports of the discovery of a 29.6 carat blue diamond in a South African mine by Petra Diamonds. The diamond is one of the rarest and most coveted in the world, with a possible price tag of tens of millions of dollars,.

Development Diaries reported to us that farmers in western Kenya are now benefiting from carbon credits generated by improving farming techniques. According to them, those are the first credits worldwide issued under the sustainable agricultural land management carbon accounting methodology.

Right on the back of that we reported that International pop star Bono in collaboration and partnership with D’Banj and the Tony Elumelu Foundation have launched the ONE Campaign in Nigeria; an new initiative aimed at fighting extreme poverty in Africa through agriculture.

And from the Tunis Times, aeronautics company “Oxygen Aeronautics” has created the first 100% Tunisian plane. The plane greeted the world on 22 January at the National School of Engineers in Sousse and will focus on domestic consumption for now.

From Ventures Africa, we gathered that Samsung Electronics Nigeria Limited has launched an engineering academy in Abuja, Nigeria to provide aspiring teenage engineers with training on refrigeration and air-conditioning systems.

And more tech news, TimesLive SA informs us that the South African mobile social network Mxit has announced the first phase of its expansion for the emerging market with the launch of Mxit in India and the release of Mxit 7 for Android and BlackBerry users.

And that’s our news round up for the week.