Mwanza’s mine, a ruddy gash on the banks of a small stream whose waters will eventually reach the Congo River, is at the center of one of the world’s most important sources of gem-­quality ...

The country is aiming at buyers of more expensive jewellery, while highlighting that its gems can be traced back to Botswana ...

but another massive gem managed to give it a run for its money after it was dug up in Botswana earlier this week. Anyone ...