Gem Diamonds has uncovered a remarkable 212.91-carat rough diamond at its Letšeng mine in Lesotho, marking the 13th stone over 100 carats discovered by the company this year. The high-quality, type II diamond was found on September 19, just two weeks after the recovery of a 126.21-carat rough, making it the fifth large diamond retrieved in a little over a month. Earlier in September, the company also discovered a 122.20-carat stone, following a 129.71-carat rough