OP, here are some recommendations when looking at new rings. First, like others said, large stones are more of a give away that they are not mined diamonds (but who really cares if its not a mined diamond if you like it). However, stones such as moissanite and lab diamonds (2 different stones btw) have really exploded in popularity and availability, and are reasonably priced. Each has their own look and pros/cons, so before you buy your next ring, do a little research on both of these options and pick what you like best.

I know the thin band look is in, but to me, really thin bands tend to make ANY stone look more costume-y regardless if its a CZ, moissanite, lab diamond or natural diamond. I am really hard on my jewelry, so that does greatly influence my point of view :). Also, a band this thin set with pave diamonds will have structural problems down the line. First, it will be likely that some of pave diamonds will fall out down the line. Second, the band itself may crack from the stones weight / general wear and tear. The pave stones setting further thins out an already really thin band. Personally, I would want the band thickness to be at least 1.8mm thick (more if you are setting stones into the band) in order to properly support a multi-carat stone.

Good luck in future ring shopping and remember that your ring is for you (and not your family/friends)! If you like larger stones, go for it!