These were from the Davis brothers that had a store in Pennsboro several years ago.   I used to go there 6-7 times a year and buy these "tops" as I called them but they are end of canes.   They made handmade marbles in this family for years and are known worldwide for their quality.  The small one has a big band of green aventurine in the wide green in the 3rd picture.   Camera does not pick it up well.