Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
This is a great deal! We purchased these at a close-out of JEWELRY GRADE stones! These banded agate stones are flawless, jewelry grade and high gloss. We are able to offer these so low as we got a great price on them and are passing along the savings! When we have no more they will be gone!