Porcelain

Porcelain - the Mother of all Lamps   · Porcelain, also known as the white gold, or as that fragile commodity in the china shop, which is visited by elephants, was first made in China in the 7th century. Depending on the definition, ceramics are also included, which differs from the pure porcelain in the sintering behavior. Porcelain was also the most useful material for the simple fitting of the Edison Bulb. We offer here some timeless and simple lamps for every household including suitable LED bulbs.

more about porcelain: https://en.wikipedia.org/wiki/Porcelain