Beautiful 1.0 carat moissanite ring U.S. Ring size 5.5 band style: knife edge metal: 925 silver Moissanite is the second hardest to diamonds on the Mohs hardness scale; Based on rankings from one to 10, diamonds are a 10 and moissanite is a 9.25-9.5 Moissanite has over twice the dispersion value of a diamond; it has a greater fire that is visible when you rotate the stone.