3 week old mystic onyx gender?

[Martiver4]

It is a pullet. Mystic Onyx pullets are black and cockerels are a goldish color. (Picture from Hoover’s).
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I got 2 chicks and both where all black although one is staying black and the other is getting color...

 

[JacinLarkwell]

I got 2 chicks and both where all black although one is staying black and the other is getting color...

Typically that comb would make me think male, but I know mine liked to pretend to be male for a couple months