The Cologne Earring. 11th c. in an cesspit of the medieval Jewish quarter. Gold, richly ornamented with gemstones, pearls and an antique dark blue Roman cameo depicts a warrior, clear similarities to the work of goldsmiths at the imperial court. "lunula" or three-quarter moon shape. unusual details to conclude that is a unique piece. alternation of turquoise-coloured glass beads with pearls and dark red glass. From the early to the high Middle Ages, glass was an extremely valuable material.