Archaeologists excavating the ancient port of Caesarea discovered a mother-of-pearl tablet inscribed with a menorah, dating from the 4th or 5th century. It was likely part of a box housing a Torah scroll and is the first artifact of its kind made of the precious material bearing a Jewish iconograph.

http://www.timesofisrael.com/unique-mother-of-pearl-menorah-etching-found-in-ancient-caesarea/