It;s not brown as such, but looks like the first layer of a female cere. It's got a bit of the crinkle that they normally have, but is only in the centre.
My Mum broke quarantine
She had Pearl on her shoulder then went and got my tiel sat him next to Pearl on her shoulder and let them out with the other budgies. So I gave up and she's getting playtime with the others. She got a LOT of singing from my single boy, so that would suggest she's a girl right? or do boys sing to boys? She also followed him around obsessively and pushed my tiel of his perch.
I've no intentions whatsoever to breed her, she's simply going to be a pet and a friend for my single boy, it doesn't really matter if she is in fact a he, I'd just prefer a girl, so Poirot will stop making eyes as Silk LOL.