One plus to buying your promise ring online is that you can customize it right before your very eyes! Many online jewelry sites will allow you select the shape of the stone you wish, such as oval, square, radiant, etc. The sites will then allow you to engrave it or not and even pick the color of gold or type of silver you wish to use. You can pick how big of a stone you wish to have and what size you need, all before your very eyes! Your price will vary from website to website, so you may want to compare prices before buying.