Question regarding CZ earrings

[LuckyTaxi]

So my friend decided to get his ears pierced and told me he's getting these CZ earrings that are like 1 carat.
They are 5mm i think and i told him they would look fake. He says no as long as you dont have them in your hands staring at them then you can tell. is he right? i mean i know they're not real diamonds, but can you really tell in a way where smeone might embarrass you saying they fake?

 

[Doggiedog]

Instead of CZ get moisanite. Moisanite is the third hardest substance known to man. It doesn't look glassy like CZ but is 1/5-1/10 the price of a real diamond. Just don't get them too big or else you may see a yellowish tinge. Less than 1 carat looks clear.

 

[kranky]

No one is going to be able to tell with an earring. They might be suspicious if it's so large that people would know he couldn't possibly afford it, though.