New Player - A Few Questions...
So as far as stats go, all the sPVP gear is the same, in that you can’t get any higher. They put all the stats that are spread out between armor, weapons and jewelry into just the amulets for pvp to simplify it a little. The pvp crafted gear is just for looks. The idea is, each tier you go up, you can get different skins as a way of showing at a glance what tier you are in, so you know if someone is wearing a particular set they’ve had to have played pvp so much to get it.
So essentially the answer is, no you can’t progress your stats, only your skill.