There's a surprising message on this ancient Viking ring

Archaeologists found an engraved ring in a ninth century woman's grave more than a hundred years ago, but only recently has its significance come to light. The ring was thought to be violet amethyst, engraved with Arabic characters. But recent research using a scanning electron microscope has revealed that the stone is actually colored glass, which would have been an exotic material to Viking-age Scandinavians. Ninth century bling reveals evidence of close contact between Vikings and the Islamic...