Leviathan
Terrarian
Well, technically that already is a thing: the dirt chest gives you clay, which you can change to silt in it, which you then extractinate. I admit it's not the most convenient of all options but it's a fairly decent one unless you need gems en masse.
Thanks for the tip I hadn't thought of that, I'm using magic storage also which requires a fair amount of gems however probably not as many as this will provide.