My girlfriend is a jewelry designer. She graduated from China, and she achieved today's achievements with her artistic skills.
Any mature work needs to draw a sketch first, that is, a sketch (maybe I don't describe it accurately), and then draw a detailed and accurate jewelry map after the scheme is determined.
Moreover, as a jewelry designer, we should not be limited to jewelry, but should be good at drawing inspiration from a wide range of themes, constantly absorbing all kinds of knowledge and cultivating our own aesthetic feeling.
As for the specific art study, it is enough to take regular art courses in the local area. If you get good grades, you can apply for the jewelry design major of China Geo University in the future.
Many designers have come slowly from obscure art graduates.
I hope you can stick to it.