An even bigger, black diamond was found in Brazil in the late 1800s, but experts think that one came from a meteorite.

THE origin of the volcanic pipes of South Africa and the genesis of the diamonds contained in their “blue-ground” filling are as productive of controversy as that other geological puzzle—the ...

In addition to kimberlite targets ... Teeling said Botswana Diamonds was “extremely fortunate” to have “such a vast treasure trove” of decades of diamond exploration data in Botswana.