Buff Orpingtons have white legs, like the female you have in the last photo.
Blue, black, chocolate, and lavender Orps have dark slate or black legs.
I think all are female here.
I can't tell in the photo whether the one you're calling chocolate is that color or just a dull black. There is no brown tint to the feathers in the photos, to my eyes, but pictures don't always pick up color correctly.
The two blue ones could be Andalusians. They seem to have tighter feathers, and they're maturing rapidly, which is right for that breed.
They could also be blue Australorps or maybe blue Orpingtons.
I don't think they are Sapphire gems. Those would have a yellow color on the underside of their feet. The rest of the breeds I've named will have a white or pinkish white color under the feet.