Your rings, trinkets, and accessories count for a large chunk of your stats. Getting them to at least exotic is very important for your combat effectiveness.

As has already been stated, you can just purchase exotic ones on the trading post for not a lot of gold. If you only need core stat sets for ascended there are some you can purchase with laurels. I believe there are some wvw and pvp methods of purchase as well.

You can check the wiki page on ascended gear for the various options and how to acquire them.