I think they are very classy - not obnoxious "blingy" like a lot of western wear these days.
I don't use polos, but I'd say if polos are going for $15, add $7. Something like, $21.99. People are going to be more willing to buy something at a price like that - upon first glance, someone's going to say "Hey, that's only like 5 bucks more. Cool!" Something about the $0.99 makes people round down instead of up.
I think that's going to be your best marketing tool.
They are really classy and would add just a bit of flash in the ring, and I think the English world needs that bit of bling. :]
I really like them, I don't use them but would consider starting just because they are so cute haha. Other colours and patterns of jewels (star, love heart, double row etc) would be really cool as well.