The hand-drawn and professional software mentioned above are just as an expression tool, and their functions and prospects are different. The most important thing in jewelry design is creativity. If you are confident in your creative inspiration, I suggest you choose to learn hand-drawn or Rhino software. If you have the ability, you'd better learn both. With these, you can easily find a job, and then learn about jewelry technology and market at work, so as to mature step by step.
Let me tell you about choosing study materials. I suggest choosing more textbooks written by seniors with social work experience, which are more practical and in line with the practicality and value of the industry.
Finally, I recommend "China Jewelry Watch Design Forum" to you. There are many free jewelry teaching materials, including hand-drawing, software drawing, theory and so on, and the administrators of the forum are also very enthusiastic. He can recommend many things to you. Well, good luck with everything!