Well artists tend to make art that is important to them, and all of them have different art styles and preferences. Also it is difficult to perfectly make a symmetrically balanced piece of artwork. By using different styles and contrasting colors, or at that just looks complex and interesting to the viewer you can draw them in. Another way would be to create an artwork that can touch many different people emotionally. Overall art can be many different things to many different people.
in ancient Greece or similar civilizations people wore special jewelry as they believed it helped ward of monsters like in the mythology they followed. in more recent years metal working has become more evolved and for the purpose of beauty or to display a variety of jewels bosting of ones richness
