Is it for a specific occassion such as a birthday or Christmas or whatever/is gift-giving a regular thing between you guys? If not, it's probably handier to just ask her out on a date (specify this), your treat, if you want her to be your girlfriend. More direct that way. Just be straightforward, "hey, I think I like you as more than a friend, want to go on a date with me? My treat!" and then have a date idea ready.
There's always the chance of rejection, but that's not a referendum on your worth as a person. It just means better luck with the next gal.