She is YOUR wife so you should give her "whatever" comes to your mind May be a small ring, a necklace, a wrist watch... anything you like to give her with all your love.
If your asking on a forum for gift ideas i suggest a divorce paper will save you time later on in life. you should know what your wife wants.
If you have spend some time with your wife before marriage then you know something about her likes and dislikes. So you have to choose some presents from her likes. If she is fond of travelling then giving her a Honeymoon Package present would be a better gift for her.
you have to make unforgettable day . you can gift her any product make sure that product last for at least 20 or 30 years since she is going to be with you till you live . by seeing that gift she must remember the first night