Are tea sets valuable?

There are a lot of factors that determine that
1. Material origin
For example, Yixing Purple Clay teapots are more expensive than ordinary tea sets

 
2. Production process
Handmade tea set worth more;

3. When it was made, whether it was a cultural relic;
For example, if it is a Blue and white tea set from China's Yuan Dynasty, it will be extremely valuable;

4.  The work of a design master will be more expensive.