There are two prominent
views in this regard:
1) The stone is actually a
meteorite which landed on the earth from outer space. This ultimately gave birth
to the notion that it has come from Paradise. This is the general view.
2) The stone is a remnant of the
originally constructed building of the Ka'bah before Abraham (sws) and his son
Ismael (sws) rebuilt it from its ruins. This is Imām Farāhī's view.