I think OP is talking about the shineyness of the edge/teeth on the side of the bezel.
I have noticed this myself especially when under the intense bright light at a jewelers counter.
The polished teeth are very shiny and reflective on the GEN while the REP is not as reflective.
If a person knows to look for this, an obvious tell can be seen from across the room.
I think one could polish this oneself and make it shiny.
Anyone care to do a DIY?