im goin to exchange my female budgie for a young 4 month old budgie and i was wondering how i could tell them apart all their ceres are purple

I remember Shawna posted a great picture of her girl and boy..if she reads this she may be able to redirect you or repost.

 

Boys generally have very pink ceres and the coloration is even and have almost transparent nasel rings if any.

 

Girls generally have a more lighter whitish pink, with white nasel rings

 

Hope that helps.