RAPAPORT... Gem Diamonds has recovered a diamond weighing 161carats from its Let??eng mine in Lesotho. The miner found the "high-quality" white, type IIa stone onOctober 28, it said. Including this rough, Gem Diamonds has retrieved five white stones over 100 carats this year. It also produced a further three of that size in other colors. In 2018, the mine, known for its large, high-quality stones,yielded 15 diamonds over 100 carats. Image: The 161-carat diamond. (Gem Diamonds)