Male or Female?

I have babies that are 7 weeks old and I am ready to give them away.  How can I tell the males and the females apart and....are they old enough to give away.  They have been weened for almost 3 weeks?  

[ireneo]

It all depends on the type of finch. I googled "finch gender" and a site came up about how to determine the sex of a finch. But it gave step by step directions depending on type. Hope that helps. Sounds like it's kind of tough.

[finchfriend]

Thanks for the update.  We have Zebra finches and white finches(nothing fancy-just the pet store models).  I am trying to determine the sexes by checking out their orange beaks.  Apparently, males have dark orange beaks and the females have a lighter beak.  I just wasn't sure whether there was a better or another way to tell them apart. They are still to immature to tell by the beaks.  They still have a lot of brown in them.

[beautifuldisaster486]

the male sings, and is also darker in color, I use to raise them myself

[beautifuldisaster486]

and when the beak turns solid orange, thats when you know they are ready to be taken away from the nest completely