It's been fun looking at all these blondes.
I've seen "platinum" coloring discussed on here, where the Yorkie is a very, very pale gold all over.
I have seen one actual white Yorkie at a Yorkie meet. Not silver, white, with a few black streaks. The owner swore up and down he was full Yorkie. His face and body shape looked like a pure Yorkie.
As you can see from my avatar, I have a blond boy. I adopted him from someone else, so I'll never be 100% sure of his heritage. I think he's beautiful regardless.