While the Aterna and Moissanite are both members of the same "Silicon Carbide" family of crystals, the Aterna's structure, hardness, and optical brilliance outperform Moissanite in every aspect. Aterna offers a pure and clean colorless beauty that rivals Moissanite's near-colorless with hints of green/yellow hue's. Moissanite is also Not cut like a diamond due to its structure. Aterna is cut to the highest Ideal diamond properties. The brilliance and true diamond sparkle are incredible.  Aterna also rates at an impressive 9.5 hardness while Moissanite is rated at 9.25. This near diamond hardness will not change color under heat. Moissanite will turn a bright yellow upon heating and can affect the color.Colorless Aterna is sought after for their breathtaking purity and radiance.  You can read more about the Aterna here.