I like this marble too and I agree with handmade.
It is probably purple--back light it to find out.
Just use a little high powered flashlight.
Polish these marbles up a bit before you shoot them.
Just some window cleaner and a micro fiber towel will make them shine the best.
Do not get me wrong, I have plenty of dusty marbles but if I am proud enough to post them, I will do my best to represent them.
Marble--On!!