Like hair and skin color, genetics are responsible for the color of your eyeballs. It is not possible to get permanent blue gem eyes without breaking that genetic code or cell structure. Melanin causes eye color to change. Very little melanin makes the eyeball blue. So while there is currently no way to make eyeballs blue , some research is underway in different parts of the world to do just that. However, if you want, you can use contact lenses or make your eyes blue through Photoshop.