Large Moissanite Ring D Color Diamond AlternativeD color is the highest grade in the colorless range for moissanite completely colorless, with no detectable yellow or grey tint even under magnification. Combined with moissanite's refractive index of 2. 65 (higher than diamond's 2. 42), a D color stone produces more fire and brilliance than a diamond of equivalent size. On a large center stone, that difference is visible and immediate. This is a ring that commands attention from across the room. The