My peperomia rosso has been doing extremely well for months but suddenly (perhaps within a matter of three-four days) some of its leaves have started turning golden-yellow.

Peperomia before:


Peperomia now:



Someone please help! This plant means a lot to me as my significant other got it for me! (I do have a failsafe just in case though, as I have a very successful cutting just in case).

THANK YOU!

bump

Have you fertilized it and if so what with, and does the pot have drainage holes? Is it only the oldest leaves that are yellowing?