This is a more complicated question and maybe theres even no answer to it ...
Best thing for you is to always have a look at a taming calculator and decide every time new, if you want to wear your jewelry today or not. Some things to consider ...
- You can gain taming only on success. Having a higher chance on gaining could result in beeing slower as with a lower chance but way less taming trys.
- Many skills have a kind of 'sweet spot' for gaining. As far as I remember best gain chances are, when your success rate is about 65-75%. (Even if that is a thumb rule for crafting skills, I use it for taming as well.)
So I would suggest:
Decide which animals/monster you want to tame today and get your taming chance from a calculator. (Even the one from stratics can giv you that value: just let it sort for the taming chance on first try.) Then compare your chances with and without jewelry and make your decision.
At least at higher levels you can do other things besides pure taming for skills:
- looking for a decent pet of some kind
- looking for a pet with a special/rare colour
- collecting pets for the zoo
As an example: My tamer is at 112.x and jeweled up to 115 (cant afford a 120 yet). I mostly go for ki-rins to donate them at the zoo. Actually I am planing a second tamer just to feel the pain of it again. *g* (I have an advanced char token from the 8'th anniversary edition left and someday it will turn into a fresh tamer. I wonder, how many ki-rins it will take from 85 to 115/120.

)