What is the most expensive piece of pottery ever sold?

The worlds most expensive ceramic, a chinese imperial revolving vase sells for a whopping $41.6m at a Beijing auction. Ancient Chinese artworks predictably sell for grand prices. And proving so is an imperial yangcai revolving phoenix vase that was auctioned off in Beijing city a few days ago for a staggering $41.6m.

Is all majolica marked?

Marked majolica is generally indicative of quality. Unmarked majolica makes up the bulk of majolica production. Makers were inconsistent. Some marked everything, some just a few pieces, many marked only the main piece of a set or service.