This marble features an actual Herkimer diamond floating inside which Chris mined himself from a New York mine. How cool is THAT!! If I didn't already have one in the collection, I'd never be letting this go. I love the imploded side as well, it's sort of like a picture of the mine from the outside, and then you flip it over and you see inside the mind. At least that's what I imagine here anyways, ha! SWEET marble!! Signed 'Pan 02' (Pan is Chris' nickname that friends gave him and his early marbles were signed with this nickname).