White crested black polish

[LisaChick1]

I have a 2 month old white crested black polish who has started to get a hint of turquoise in it's feathers. Is this a for sure sign of cockerel in this breed or does this breed just have that type of feather coloring...kind of similar to the coloring in a black austrolourp?
Thanks so much!!

 

[sourland]

Black birds frequently have a green tint to their feathers.