cere color

I have a male budgie named Griffith, he's 1 year old. recently his beak started becoming darker & rough. This is how he used to look normally. This is how he looked on 3rd this month. it's already kinda dark here. This is how he looks today. It's a lot darker. My other male budgie (Levi)...

I’ve always been told boy and our vet never questioned it or the not bright blue cere, but I’ve always kind of wondered… boy or girl? No eggs have ever been laid and he usually has some blue in his cere.