You'll need to use the trial-and-error method or go back to J'nanin
using the lining book near the spot where you first entered the Age. If
you're using the former method, I can give you some hints if you
highlight the blank space below...
1. You can't use the right fulcrum position to achieve your goal.
2. You can't make the counterweight weigh the same as the orange ball
to the right of the lever with the weights you have.
3. The crystal-like weight is worth far less than its beauty over the
other weights when it comes to solving this puzzle.