When Diablo 2 was first released, there was a sequence you had to go through in order to get the unique rings. In order to get the Stone of Jordan, you needed to first get the Manald Heal and Nagelrings.
All three rings are back in Diablo 3 (plus a bunch more).
The Stone of Jordan (SoJ) became a unit of currency throughout Diablo 2, to the point where Blizzard created a special event that could be triggered by selling enough SoJ's.
Does the Stone of Jordan in Diablo 3 have any special properties or significance that sets aside from other items in the game?