No matter which direction you design, you can't do without hand drawing. Hand-drawing is your skill and tool to express your design ideas. Of course, drawing jewelry design drawings does not mean that you become a jewelry designer. However, if you can't handle hand-painted jewelry, then you can't express your design works well, so hand-painted jewelry design is very important.
Secondly, if you are good at hand drawing, you will learn electric drawing faster. My friend studied hand-drawing and electric drawing together when he was studying in Peng Zhong, and now he has finished his study. This school is still good, you can refer to it.