Research the history of metallurgy. Have students mold clay into goblets or other basic items. Fire in a kiln. Rings date from early times. They represent the sun, and draw on its power.
Wedding rings represent a form of a magical amulet.
Research the origin of the customary ring finger. Design a mural or a floor plan of the castle. Include a compass rose. Each mobile will become a statement from one of the characters. Gather tokens, pictures, and drawings to represent the character, their traits, and their actions.