We did blind tests when we were shopping for rings. It was stupidly easy to tell - moissanite sparkles more. Didn't go the way the jeweler wanted, though - he

We did blind tests when we were shopping for rings. It was stupidly easy to tell - moissanite sparkles more. Didn't go the way the jeweler wanted, though - he only sold diamonds, but had a moissanite ring he was cleaning for a customer for comparison, and we liked the moissanite better.