Moissanite looks a lot like a diamond. They're both clear and sparkly. But moissanite is not a fake diamond and shouldn't be thought as one. It's a beautiful gemstone in its own right.
Because of how much a moissanite looks like a diamond, it has become the most popular diamond alternative.
Moissanites are also great because they're completely earth-friendly and conflict-free. Since moissanite is developed in a controlled lab, there's no mining involved or harm to the environment.