In addition to suppressing and ignoring jealousy, another option is to learn how to acknowledge and deal with it. Just as fear is quite a natural thing and hinders people in accomplishing their goals, so can jealousy be a hindrance to happy relationships. Both can be successfully managed however.

  Courage is resistance to fear, mastery of fear - not absence of fear. - Mark Twain

I believe the same can be said of jealousy. Also note that unchecked jealousy is not strictly a problem of polyamory; it wreaks havoc even in monogamous relationships.