The end result is you should talk to your partner and find out what they want and discus it.

If I had bought my wife a diamond ring it would have showed her I really didn't know her.

Pull out whatever study you want that says men are wired X and women are wired Y - that study is based on samples and statistics. You'll find plenty of girls that like trucks and boys that like dolls. Treat the people around you like individuals who can have both male and female traits and their own unique personality.