I've been told by some experts they can't say what the strand in the swirl of this marble is, except that it is a WV swirl marble. One person suggested it could be the start or end of a run but it looks like a definite thread of something in the swirl to me, and too pretty to be "trash" that got into the process, although that may be the case.
Has anyone see this in their marbles? I have another marble that is ice blue with white swirls and has the same thing.