Before anyone says, “But in the ‘Indiana Jones’ movie, it was a ceramic cup!”, read the Gospels again. Jesus and His disciples were the guests of a comfortably well-off family in Jerusalem, possibly relatives of one of the apostles, or connections of His undercover followers among the Jewish leadership. At the Last Supper, they would have used their host’s best Seder service vessels.
Even poor extended families built up, over generations, a good set of durable dishes to celebrate the Passover. The Last Supper hosts could have been Jesus’s paternal relatives. St. Joseph was “of the house of David.” Even though he was a carpenter in the hinterland, he had some upscale relations, who had obligations to less fortunate family members, including hosting them for religious festivals.