Diamonds would probably work. But you might not want to get her started on that just yet. It could become quite expensive in about 10 years.I have no idea what I'm going to get for my daughter. I always get her something special just from me every year for Christmas, and it's usually not on her list.
Very romanticI got my girlfriend a really thoughtful gift... I made her a panda bear at build-a-bear, then weaved a ribbon bracelet (green, orange, and white) because I'm Irish and placed a sterling silver claddagh ring on the braclet. So, at first she'll think oh its a cute but thoughful stuffed animal but then see the ring... kind of a nice suprise