Loot Worth Keeping - Diablo 2
Rings are split into two categories, one for casters and one for melee. Casters need a ring with Faster Cast Rate on it followed by tanky stats (health, strength/dex, all resist). Melee will need a mostly tanky ring with stats like Strength, Dexterity, Life on it. Additional bonuses that can make a ring go from good to amazing for both Casters and Melee are more tank stats (Poison Reduction, Life Leech, Life Replenish) or exceptional attack stats like Attack Rating or bonus to min/max damage.
Caster Ring:
+ 10 Faster Cast Rate
+ 5 - 15 Dexterity
+ 50 - 90 Mana (or) 30 - 40 Life
+ 4 - 9 Life Replenish
+ All Resistance (or a good single resistance)
Additional Bonuses: Poison Reduction, Single Resistance, Attack Rating, min/max damage
Melee Ring:
+ 10 - 20 Strength
+ 10 - 15 Dexterity
+ 30 - 40 Life
+ 50 - 90 Mana
+ 50 Attack Rating
Additional Bonuses: Life Replenish, Poison Reduction, Single Resistance, All Resistance, Attack Rating, Life or Mana, Min/max damage, Life Leech