It's good to study jewelry design in France, depending on what kind of school you want to go to. If it is public, it is basically taught in French, so you need to learn French well in advance. As for the chosen school,

You can consider the public Strasbourg II and Toulon, the private CREAPOLE School of Advanced Management Art in Paris, the Bourne School of Art in Paris, and the olivo School of Design in Paris. In private schools, many schools teach in English, but they still come back with French certificates. After all, not knowing French has a great influence on life.

What you need to prepare is to learn French well, about 500 hours, and then take tef or tcf. Please keep asking questions.