Yellow eyes with silver gradient may be impure. Normal eyes with silver gradient are green, blue or yellow-green; if they are pure yellow, it means that the silver gradient is not very pure. If they are yellow-green, Then it's okay, you need to observe carefully to distinguish.
Tips:
In addition to the eyes, you also need to check the coat color, body shape, nose and paw pads, and the underlying fluff to determine whether the silver gradient is pure or not. It needs to be pure white, with silver-gray hair tips; relatively stout, with a pink nose and black or chocolate paw pads.