Important: When you are not in sufficient light conditions, may show silver, rainbow color is not obvious, please understand that this is normal, rainbow color is required to present the angle, not all light conditions and angles are very obvious.
The following picture is the effect shown by the professional camera, completely achievable, even in natural light, the required base color are pink, blue, purple, the photo real without adding any filters, just the angle and light problem (which is very important).