Pretty band. I doubt it can be sized up that much without all the stones having to be repositioned. If WF is open tomorrow you could always call them and ask.
Wow! That is a great deal! I had my channel set band sized up a whole size not too long ago. The jeweler had no problem with it. I agree with the PP, give Whiteflash a call or try to email them and ask. They might not respond too quickly though, since Hurricane Ike has wreaked havoc on Houston!