The intricate story behind the the Lesotho Promise. The stone, a 613 carat rough stone, recovered in the mountain kingdom of Lesotho, is perhaps the most talked about diamond of the 21st century. Watch how a dedicated team of world class professionals in pursuit of perfection are making history. From the mine where it was unearthed, to the headquarters of Graff diamonds, where the polished stones were delivered, find here a rare opportunity to see a glimpse on how this important stone became a jewel.