While human slavery is a fact of life in African nations like Mauritania and Sudan, Tanzania now is emerging as the latest center for the exploitation of child labor. Today, young children are forced to work in the country's mine, harvesting the valuable mineral resources of tanzanite, coltan and diamonds. Tanzanite, a semi-precious, purple-blue gemstone unique to Tanzania, was discovered for the first time 24 years ago by the Masai tribe. Its uniqueness and stunning beauty make it as sought-after and as valuable as diamonds. The resulting tanzanite mining rush lured thousands of Tanzanians and refugees from neighboring Congo, ...