Q: Is a Moissanite Engagement Ring Right for Me? A: The biggest pro of moissanite is the cost. If you are on a budget, definitely look into this gem. Less expensive than a diamond, but more durable, and some say more brilliant than a cubic zirconia (cz). Moissanite is actually more refractive than a diamond, giving it more brilliance and fire than either a diamond or c.z.