For us, well me anyways, jam has actual fruit parts and is someone lumpy because of the fruit. Jelly is just the juice part, a couple days of draining from a jelly bag, then a restraining of the jelly a second day to make sure none of the pulp it tiny seeds got free.

It is the double straining I think that gave my wife's jelly such clarity.

Yeah Diabetes sucks for the berry lovers, but I still eat them, just not as many.