My wife is a jeweler, since i had my first 3d printer i have been designing, and printing prototypes for her. The method we've been using is, she shows me her hand drawing sketches, and i traduce it in to a 3d model, so that model can be printed in the right size, so she can make the mold for her pieces. i've modeled earrings, wedding bands, bracelets, pendants, apple watch motorcycle mount, this have been the 20% of my work as a 3d designer.