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.