Hi there and Welcome to YT

All Yorkie Puppies are black and tan at first. Then they will gradually start to change to their adult colors. Sometimes, though a Yorkie will stay that way... Forgive me, If I am incorrect.
I have Suzi, She just turned a yr old. I had her clipped down a few months ago. Her coat is growing back into a silver blue color. She has the tan underneath her chin. The tip of her tail has black on it. She looks so cute .
We also have a lot of YT members on here with really pretty gold or red Yorkies , it is amazing what different hair styles are Yorkies can be groomed in! I love to see al their pictures. You are right though. All the puppies are Black and Tan

We also have members on here that have very beautiful Biewers

And then other members that are looking for a yorkie just like you.
Good luck in your search.