The necklaces(which are BoP) all come equipped with a gem slot for further customization, making them a pretty nice prize for end-game Jewelers. The materials on these rings and amulets are pretty hefty though, it won't be an easy task to make them. Everything from Primal Mights to Hardened Khorium Bars to gems from Mount Hyjal and Black Temple are needed to craft these beauties. And let's not forget the Sunmotes for the rings, and the Primal Nethers for the necklaces.
As you can see, you'll need to jump through some hoops to get your hands on these, but they seem worth it. If you want to see for yourself, check out the stats and materials after the jump. Thanks again, MMO Champ!