[Q] How do Chaos jewels work when upgraded into a piece of equipment?

[Wazakesy]

Most probably yes.

Example if you use 3 Weak chaos,

0.78 × 3 = 2.34

2.34 x 4.5 ( If your bonus damage is 450% ) = 10.53 #

Hmm, thanks again! It seems your Rinnegan does work!

I calculated it and found this to be true. Thanks!