Promise rings are a symbol of commitment or devotion between couples. Think of them as a token of love, that shows you are exclusively dating, and it's also used to express other things such as - a promise to be faithful, keep a secret, to save virginity and many other things.
To make couple promise rings unique, most lovers like engraving a special message inside the rings. Such message may be as simple and personal as you want: both the couple’s names, or their anniversary date, or one phrase “I LOVE YOU”, or the magic words of you two. For some ring bands, you can also have the outside of the rings engraved. Personalized couple rings are most popular now.
If you are shopping for promise ring set, you probably know it is possible to spend several tens or hundreds of dollars on matching rings. More, good quality, stylish and attractive couple rings can easily be found online at more affordable prices. It isn't necessary to spend more than you can afford. Sometimes the simplest design says it best of all - that your love and commitment is a permanent thing.