text: It depends on you and your fiancée-to-be; you can do something big and public, or something big and private, or something small and private – I'm assuming you want it big, and probably public, since you noted that this is for someone “rich”.  You can get your proposal “advertised” – either in the newspaper, at a movie theater, on a billboard you pass often, heck, if you have the money, get a commercial on TV.  You could send your girlfriend on a big “treasure hunt” – be sure to have lots of gifts along the way, perhaps send her to a local bookstore and leave a book that you bought there for her to get from the person at the register, or to a coffeehouse where you’ve purchased her an espresso machine – you could even do this just in her house (books & videos in a basket in the living room, espesso machine in the kitchen, etc…).   You could buy her another piece of jewelry that’s engraved with “Will you marry me?” on it.  Whatever you do, make sure it’s something she will enjoy and appreciate; don’t embarrass her or give her a puppy with a ring tied around its neck when you know she hates dogs.  Good luck!