GIFT FOR HER: JEWELRY
Diamonds are girl's best friend and the only thing men really can't go wrong with. So go ahead and get her a diamond necklace, ring, bracelet, or a watch. The most popular watch for couples is G-Shock and Baby-G, called Lover's Collection, created with romance in mind.
If you are a wallet-conscious romantic, there are plenty of gems and metals like sleek rings and bracelets with precious stones (that are pretty close to the diamonds) will surely make her happy and create the the sparkle in her eyes.
Extra Points: Present it in a pretty jewelry box, gift wrapped!