I have looked at several different websites that offer applets for designing your own engagement rings. Amazon has a very attractive ring design feature that can help you achieve what you want through several simple stages. First, you narrow down the choices of available diamonds – by shape, price, cut, clarity, color and carat-size. All this is done on a single page, mind you! Then you have to pick the diamond you want from a list. After that you select the setting: the metal and the style. At that stage, the price will be shown and you can simply add the newly designed ring to your shopping cart. Whether you actually want to buy the ring you have designed, is entirely up to you. But it sure is fun to play with this applet! The only thing that is clearly missing is the ability to add a custom engraving to the design.