Board Thread:Game Discussions/@comment-115.66.181.84-20141213142330/@comment-26439481-20150611063647

A deepdive on rings and amulets has been done here:

http://knights-and-dragons.wikia.com/wiki/User_blog:SDMarukokun/Rings_and_Amulets_research

There it can be seen that it 3.5 points of att/def vs health.

A 2* gives you max about 75hps more, but a 3* can give you over 100 hp extra. With the stat inflation, HP rings will keep their value, while even a 400 att/def ring will be old with better and better rings/amulets coming and stronger armors. I like high HP items, there are many situations where the extra 50-100 HP gives you one additional hit against the EB or Raid boss. But you need a calculator to check when it is wise to use.