On March 13, 2017, five artisanal diggers working near Koyardu, in eastern Sierra Leone, unearthed an extraordinary 709-carat rough diamond. Roughly 2.5 inches wide and 1 inch deep, it was the world's 14th largest diamond ever found — a stone of a scale most miners never see in a lifetime.
It belonged, legally, to Pastor Emanuel Momoh, who had supported the diggers' work. In a region where such a find could vanish overnight into illicit channels, what happened next would define everything.