You responded to the wrong comment.
Moissanite is a nonporous stone, so it doesn’t get cloudy. It can get dirty on the surface like a diamond, but you can just rinse it off. On the other hand, a diamond will turn cloudy if it is in a house fire, while Moissanite will not.
Naturally occurring Moissanite is extremely rare, while diamonds not so much. A geologist might judge you for wearing something that isn’t real Moissanite.
This is already about to pass in California. legiscan.com/CA/bill/SB478/2023
The FTC is going to write a rule similar to what local governments have given themselves power to regulate. The article gave some examples, but it is not exhaustive.