Upcoming Unique Items

Ghost Buster would love to have that jewel during Tempest! Potentially claw as well.

As for ring being good for MOM builds - i don't think so.
morph_sixlink for my last MOM build (Tempest).
Which aura would you even run? Clarity is not needed and is definitely not worth it; you don't have much armor to scale with Determination; no evasion scaling to make Grace worth it. Wrath/Anger are pretty much the only options. And it is not a free aura by any means. Yea, it reserves no mana, cool, but you lose rare ring.

That is 200+ life, 200+ mana, mana regen, resists. Even just 400+ total HP pool loss is not worth it. Now add the fact that w/o resits on ring i would have to drop Lightning Coil or Atziri's Step. Pretty bad.
Only thing i would consider to be worth using that ring for with MOM is hatred for physical spell/attack build.

Super strong!*
+2 lvl

@GGG i hope to god that ring works with BM, the wording is bad if it does but if it goes in not working with BM it never will and might as well try(unless u did and it was to OP).