When it comes to the selection of a promise ring, then choosing the right gemstone for it is a difficult task because since medieval periods, diamonds have been a classic option, but in recent trends, moonstones have been gaining popularity as a unique and meaningful choice for promise rings. The beautiful crystal is getting famed due to its mesmerizing play of color and mystical allure, it is a unique gemstone that can hold a special significance for couples commencing on a journey of commitment and promise.