ToME: the Tales of Maj'Eyal

So I found the Geodelath rock, but can't seem to figure out what to do with it. I've tried to have it made into a ring, but I can't seem to select it. Any advice?

You need an unenchanted (white) voratun ring for the jeweler to be able to imbue it. There are other ways to use it as well (put it into armor with Stone Alchemy, complete the Gem of the Moon quest and have an unenchanted voratun amulet available, slot it into Tirakai's Maul, etc.) If you don't have a use for it on your current character it's a good candidate for the item vault.

I used to have the item vault, but for some reason it doesn't work even after donating. However, I wasnt paying attention and found out it was arcane and I went anti magic...