Everything in the TV series depends on the habits of the crew. It may be that the crew thinks that using jade bowls can better reflect the dignity of the royal family. In real history, the royal family also used jade bowls, and many jade bowls were exhibited in the Forbidden City. The ancient royal family was very particular about what bowls to use, such as the yellow porcelain bowls used by the emperor. The bowls used by concubines, concubines, concubines, concubines, concubines, concubines and concubines were all different in color, so you can't use them wrong. If you exceed the level, it is a big mistake. Of course, jade bowls and gold bowls are sometimes used.