There is no academic requirement for the study of jewelry design. Learning a new skill is not limited by academic qualifications. Some majors need a certain degree to learn, but art teachers usually learn from the most basic, and most of what they learn is practical. There's nothing to worry about.
However, it's best to study jewelry design and improve your education in Peng Zhong. After all, looking for a job in the future depends not only on ability but also on education. Having a degree is very helpful for your future development.