Nothing is going to prove your love to your special lady like an engagement ring that you picked yourself. It might sound like a daunting task for most menl; but with a few tips, you will be able to pull it off.
The first and most important thing is to know your girl. This should be a breeze, since you already know her well enough to ask her to marry you. Think about her likes and dislikes and the ins and outs of her personality. This alone can eliminate a number of choices.