Angola will give the outcome of its first diamond auction on January 31 as the southwest African country’s seeks to increase transparency, attract more investment and boost government revenue, state-owned diamond-trading company Sodiam said. The evaluation of seven gemstones from Angola’s northeast Lulo mine that will be sold is expected to end between Jan. 25 and Jan. 28, Eugenio Bravo da Rosa, head of the Luanda-based company, said. Lazare Kaplan International Inc., the KGK Group, Rosy Blue and the Diarough Group are among diamond manufacturing and distribution companies invited to the auction, he said.