Moissanite is engineered to possess the look of a diamond, but is made of different molecules that are arranged differently and visually quite distinct from a real diamond. In fact, it requires a gemologist or special tester to discern the difference between a diamond and moissanite. The durability, brilliance, and color of the two gems are quite unique, although put a Custom Moissanite Engagement Rings next to one with a comparable diamond and they are very difficult to discern. One of the key differences between moissanite and diamonds is that moissanite stones reflect light in a different way to diamonds. Due to their faceting, moissanite gems create flashes of light that have a rainbow effect, whereas diamonds produce three types of light: brilliance, dispersion and scintillation.