Moissanite will fool almost anyone except a jeweler, an insurance adjuster, or a pawn shop buyer. Second-rate examples have been sold here a few times. This is not the place to look for something really worth having in that area, and the folks who hang out here mostly know where to get good stuff if they want it. (And mostly, that’s not Meh.)
Diamonds are slowly losing popularity as more and more folks realize that their “scarcity” is artificial and the prevailing methods of mining them are abusive of people and the environment for no good reason.
I think it is more how you feel. Is it for yourself or a gift? Are you looking for an investment or have you found something that makes you happy? If it is a gift, what will the recipient think or want? This would be my line of thinking if I was considering a purchase. Of course budget and availability would factor in to my decision.
@shelines, you have a couple of options, although so much depends on exactly what you want, and how much you want to spend. Primer: There are “natural” (mined) diamonds, which are very rare for a high-quality stone (and have a lot of exploitation issues, because they are mostly mined by people paid poverty wages.) Little diamonds (stones of .1 to .2 carats each) are cheap, and are often grouped together along with rhodium plating to up the reflectivity. That’s most of what you’ll see, commercially, in diamond jewelry other than expensive solitaires.
Cubic Zirconia is a lab-created version of another natural stone, zircon, which can easily be made as a perfect stone, although the reflectivity is not quite as high as an equally-perfect diamond. CZ is the cheapest diamond substitute. Natural zircon is also very sparkly and beautiful, but not all jewelry stores sell it (any good jeweler can find it, though.)
White sapphires can be gorgeous as well, although larger, near-perfect stones can start to get spendy.
There is a lesser-known natural stone, called danburite, which is actually more reflective than diamond. Again, it’s hard to find (any jeweler can find it, but you won’t find much pre-made), but white danburite is amazing - I have a ring with 3 large stones, it’s a stunner.
Moissonite is a lab-created diamond, so it has the same characteristics as diamond, but is typically manufactured to be near-perfect in the ratings - “cut, carat/weight, clarity/color”. It’s the most expensive diamond substitute, because it actually is a diamond, just manmade vs. dug out of the ground.