A 170-carat pink diamond – dubbed The Lulo Rose – was discovered at the Lulo mine in the country’s diamond-rich northeast and is among the largest pink diamonds ever found, the Lucapa Diamond Company said in a statement to investors. The “historic” find of the Type IIa diamond, one of the rarest and purest forms of natural stones, was welcomed by the Angolan government, which is also a partner in the mine. The diamond will be sold at international tender, likely at a dazzling price. Although The Lulo Rose would have to be cut and polished to realize its true...