Are you ready to propose? If this is the first significant jewelry purchase you've made, take a look at what you need to know about custom engagement rings. Should You Choose a Custom or Stock Ring? There's no one-size-fits-all or yes/no answer to this question. The decision to design your own custom creation or buy a ready-made ring depends on several factors. These include: Your personal preference. Are you the creative type of prefers to give one-of-a-kind gifts?