This is an incredibly extravagant gift, usually exchanged between people who are dating. I'm not exactly sure what you are trying to say with this, but it comes across a little as if you are buying her affection. You say you have showered her with gifts, flowers, etc and she still doesn't get the hint, but I find that hard to believe. I think the time is now to step up and seriously tell her how you feel, preferably when it's just the two of you and preferably leave out this gift. You can take her out for a simple dinner (or make dinner yourself) and then over desserts, tell her your feelings.
This is just my take, without knowing the specifics of your relationship.

Best of luck to you, whatever you decide to do!