Experts help to see if this is a teapot. Is it worth 800 yuan? Is it the work of a famous artist? What is the material like? What's the trick? Please be more specific.

Zheng Cunlin, word Linde, assistant of arts and crafts, graduated from Yixing Ceramic School. His ceramic sculptures are a combination of calligraphy, painting, epigraphy and poetry. The knife method is cold and heavy, and the lines are simple and quaint, reaching a high artistic realm of novelty in plain and washing and practicing in indifference. Recently, it has been well received by the domestic and foreign teapot collection circles. His works have won the third prize and excellent prize in national competitions for many times. ...