I don’t want to get your hopes up, take this with a grain of salt, but I think your Rosetta is female. I’ve been testing a crazy theory I have based on the shaft in the chest feathers, a more defined shaft I believe indicates male.
Here are 2 tuxedos from my sex links. They are 2 and 1/2 weeks old in the photos:
The first is a female, the shafts are less defined, the chest feathers give the impression of a smoother look.
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This is the male, he has long, defined white shafts. Easier to see individual feather features:
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I have very few wild patterns, but my egyptian male’s chest looked more like a sunburst, with the shafts being more defined, and I got to thinking this might be a very subtle male trait. I’m still testing it haha, so it could be crazy nonsense.