I never got the mysterious gemstone from the Romany camp in Croakwood on my main character. Apparently if you don't get it before they leave the camp, you can never get it (who thought this was a good idea, honestly?).

How exactly am I supposed to fix this quest?

I've tried joining multiplayer games and redoing the Journey to the Ink quest and revisiting the Romany camp, the gemstones drop in both expected locations and I'm able to put them in the statue, but as soon as I leave and go back to solo all that progress is gone.

If I try going to the two locations I know the gemstones are supposed to drop in solo (not multiplayer) they don't drop.

I've spent 3 hours researching and running around maps like a madman trying to fix this. I don't want to start over just for this one stupid quest, I already have like 25+ hours spent on this character.