RAPAPORT... Gem Diamonds has unearthed a 100.50-carat diamond from its Let??engmine in Lesotho, it said Friday. The white, type IIa stone is the 11th over 100 carats theminer has recovered from the asset so far this year. Gem Diamonds owns 70% of the Let??eng mine, with the stateholding the remaining shares. The company also owns the Ghaghoo mine inBotswana, which it plans to sell.