Not a bug, just unfortunate. Nothing can be done, no item replacement/creation from staff and you just have to be mindful of killing things not past those rocks in the future.
My guess is you are another light theme user like myself; that's the problem with people using white text. It is unreadable unless highlighted in light mode.
It does exist and info can be found on wiki, along with a few other posts on forums. https://wiki.pioneer2.net/w/Ragol_Ring
As for platings (aka paint) regarding Rico’s Earrings/Rico’s Glasses or anything else; Ephinea isn't taking suggestions.
Your GC# is related to your account. You can find it though Menu>Chat>Guild Card>My Card, it will be the number that shows under your character name starting with 420 or 421.