If you find a blue-gray stone on the beach, it could be more than just a pretty pebble. It could be a diamond. But you'd have a better chance of finding a diamond in Africa, because that's where...
Precious stones
They shine, they sparkle, they flash and shimmer. The crowns of kings and emperors were covered with them, and wealthy people have always worn necklaces, rings, and other jewelry made of them. They...