Moissanite has a higher refractive index than diamonds, which means it bends light more and causes it to bounce around more, resulting in greater sparkle. Additionally, moissanite has higher dispersion than diamonds, reflecting more colored light, or "fire." This characteristic allows moissanite to produce quick flashes of rainbow colors when moved, enhancing its brilliance. If you have concerns about the light or would like more information, please ask us for assistance. We can explain further and provide pictures to help you understand the differences better. Email: gemandjade.service@gmail.com