Actually, is not a piece of Viking Art. The fibula is most likely made in Burgundy, Francia, in the late eighth century. Archaeologists discovered it in an old well much further away, on the site of Dorestad the important early medieval trading town in the Low Countries (as the Netherlands was called in the Middle Ages).
The fibula is about 8,5cm in diameter and made of gold, coloured glass, red almandine and pearls. The cloisonné technique fixes the enamel to the gold. If you look carefully, you will see two crosses. The richness of this brooch indicates this fibula probably belonged to someone of high importance.
How the piece of jewelry ended up in Dorestad is mere speculation. Did the Vikings find it on their raids and bring it here? Or did someone hide it in the well to avoid Vikings finding it?