I would suspect you were misdiagnosed. I am a doctor of alternative and western/modern medicine. Passing a stone of that size has never been heard of in my 18 years of research. If it were a true stone, it wouldn't of been able to even lodge itself to become stuck. Sounds to me this stone was simply the same exact digested.
Furthermore, there is no such things as stones passing through the liver. True Gallstones can be formed in the billiary tracts that resides in the liver, which work their way into the gallbladder.
Pardon me if I am misunderstanding your post.