Promise rings come in many variations and sizes. They are simply rings that symbolize love and commitment, but might not take on the shape or form as the traditional engagement ring, even though a traditional engagement ring certainly can be one. Sterling silver promise rings have gotten more and trendier recently for a very practical reason: price. Many people are thinking twice before spending three months salary on an engagement ring, so the silver one, which can be very inexpensive, has grown tremendously in popularity.
There are many kinds of sterling silver promise rings and there are many variations on them.