I create a 3D CAD models of jewelry pieces / products / objects / environment / characters according sketches / drawings / photos / visual references providing by you. I work in 3ds Max (.MAX file format) and ZBrush (.OBJ file format). I make either high poly and low poly models. If the design is complicated or you are not sure how exactly the model should look I can start with boxing - fast, non detailed modeling that helps negotiate about shapes and proportions. Also I can make a 3D render of finished model and prepare the model for prototyping.