Refresh is 2/tick
Seems the best place to farm the Jewels of Ardor for this are on the free-standing Pixie NM, Fuath. Repops every 15ish minutes and can drop up to 2 Jewels and 0-2 Coins of Ardor. Never saw less than 1 Jewel per kill.
while so much gear in the game seems to be incredibly situational its nice to have a few pieces that you don't ever need to swap and this is just about the best example of that.
as of the lvl 90 gear just about the only other body I would ever consider carrying is something with fast cast/haste for a stun macro or something PDT-/MDT-/enmity- for the inevitable hate you will get after using this body