Ninth century ring was found in a Viking grave in antiquity . The stone is stained glass , not amethyst , as previously thought . adding an inscription in ancient Arabic that reads ' for sale ' or ' to Allah ' Artefact adds weight to theory that trade traded with Islamic civilisations .
Ninth century ring was discovered in a Viking grave in Sweden . The stone is coloured glass , not amethyst , as previously thought . Contains an inscription in ancient Arabic that says 'for Allah ' or 'to Allah ' Artefact adds weight to theory that Vikings traded with Islamic civilisations .