At 5k each Ascetic ring, I usually take a haul back to sandy and sell em. Takes me two listings, but i get em all up there..... they sell quick too. As i said before 5k each Ascetic ring on Garuda. The Saintly rings were 3k each last i checked.
I have been farming in the tomb for a while, and I noticed I had a LOT of these rings on Lightday, from the rock eaters near Goblin Gruel, and ONLY on Lightday. (6 stacks of flint stones, imagine the slaughter I did on those worms)
Necropost, I know, but they meant you have to be at at least the "Adept" stage in alchemy, it isn't a key item. I'm a crafting noob so I don't know what levels exactly let you do the cap break for the adept status, but you could probably look that up around here if you need to know.
I have a feeling its a random monster drop so it drops from everything but certine monsters have a percentage of chance when i go to the tomb i will confim this