How to identify aftermarket bezel ring?

[onthemoney]

Originally Posted by greekbum

Those are not original. Rolex charges around $265 for a complete bezel assembly if you take the watch to them.

Originally Posted by Spoonage

Typically if something says unbranded I would assume aftermarket. When it comes to things like this it it were authentic I imagine the seller would be all over that and list that in description. I don't have enough experience to know if it's already mounted on a watch how to tell. I will leave that to the pros on the site.

That is my point exactly. If mounted on a watch you buy, how to tell the difference?
My friend had an aftermarket on his, and I couldn't tell it apart from mine.
I wonder how to tell the little differences, and if there is actually no harm in using the aftermarket.