@Skyle and the rest..here are a couple of pictures of my Brahmas. I have bought eggs this year from 3 different breeders, but none has any claims to be a pure, standard breeder.
The big white just started laying eggs this week.
Then orange/black are young (I think) pullets..
Then a silver Brahma, which I think is pure.
There is one white young, which I am sure is a rooster..
@kwik-kwak welcome!!!! Another Bulgarian, I am excited!!! Where do you live?
Brabanter isone of the breeds I ordered eggs from the Netherlands but nobody was able to find any.
I'm not very expert on the other colors of Brahmas since I'm breeding only white columbian black and white columbian blue. So maybe (and probably) I'll say wrong things.
As far I'm seeing in these photos, the gold partridge it's maybe too red/dark, it should be lighter in females, that color tone should be seen on males neck and hackles; she doesn't look a breed mix, maybe a color mix or a poorly bred color.
The white columbian black looks like a cockerel.
The silver partridge it's really nice though and she has a nice shape (I looove that gaze

).
The buff (can't tell if it's a weird buff or a mix of colors) it's either a very poor quality or a mix: the feet are poorly feathered, Brahmas should have feathers on the outside and middle fingers. Plus the neck it's too dark for a buff columbian and the tail feathers look white/very light blue, while they should be the same colour of the markings on the neck.
The white one could be maybe be a very very light blue columbian? (I think I see a bit of blue on neck and tail), she has a pretty shape, too. Maybe the breeder is trying to get whites by lightening the blue on blue columbians?
Are the white and the silver partridge from the same breeder?
http://www.kippenencyclopedie.nl/php/index.php?title=Brahma
This is a really nice site about all chicken breeds, you can see all the Brahma colors and how they are called in many languages (you have to click on the color name and you'll see how it's called in the countries and some details on how the markings should look)