As I remarked, I am not an expert on seals or seal-beads, so I'm not in much of a position to make a determination about your specimen. I cannot say I've seen anything quite like it.

Is it hematite? And where is it from, and what were you told? Did you try to make an impression of it in a soft material like modeling clay?

It often happens that it is much easier to say that something is a fake than that it is authentic—particularly based on a photograph. Fakes are much easier to regognize. But your bead could be "a seal" whether it's ancient or modern.

Jamey