Board Thread:General Discussion/@comment-3123266-20140303175822/@comment-173.178.202.52-20150114002331

Probably the soul gem will not appear in any movies, it will alreay be in Thanos possesion. Unless Marvel Cinematics change it, the soul gem should be with Adam Warlcok, that Thanos robs and put Adam in it. SPOILER(maybe): Gamora will maybe die when Thanos gets the Soul gem, reference to the comics.

So only five gems should be represented on all the movies as another thing than a gem (Except when they open the Orb), and in Avengers III and IV, Thanos shoul have at least one gem (Soul).