Rural King Mystery Chicks

[PrincessLayer16]

Hey yall!!
They were in a bin with other chicks that looked completely different, so I’m not sure what we ended up with. They are about a week old. Any ideas on what they can be?
They are bigger than our Jersey giant and Australorp chicks that are the same age.

 

[Iluveggers]

If I had to guess, I would say sapphire gems?

 

[JedJackson]

I see little bits of brown on the wings. Is that dirt or is it actually part of the feather color? If it's dirt I'm thinking they might be white Jersey Giants.