Board Thread:General Discussion/@comment-3134600-20140811224344/@comment-26300145-20150411041457

Ok lets use the process of elimination.

The Aether is not the space gem because that's the tesseract. It's also not the power gem because that's been confirmed to be the orb. 4 gems left, time, reality, soul and mind. Now lets take into account that when Jane Foster and Malekith had the Aether their eyes turned black. To me that sounds like something to do with the soul. Now back to elimination. It's most likely not the mind gem because the scepter is the likely candidate for that because of the way Loki was controlling minds with it and I think someone has confirmed it. Jane Foster and Malekith weren't speeding up or slowing down time when they had the Aether. Furthermore, they werent travelling through time, which eliminates the time gem. So now we're down to the reality and soul gem.

These are what each gem does according to marvel.wikia Paying attention to only the soul and reality gem, the reality gem inhibits users to have powers akin to the Cosmic Cube. Jane Foster and Malekith never demonstrated powers of that style, that now eliminates the reality gem. All we're left with is the soul gem. So heres my conclusion:
 * Power Gem – Increased strength and durability, enhances virtually any known superhuman ability, energy manipulation.
 * Time Gem – Time travel; stop, slow down or speed up flow of time; accelerate or slow down aging; see into past/future.
 * Space Gem – Travel through space, mostly through teleportation. Able to interfere with the motion of other objects.
 * Soul Gem – Observe, attack or even steal a being's soul or spirit. Also used to revert individuals to their natural state.
 * Reality Gem – Alters all of reality; similar to the effects of a Cosmic Cube, but much, much higher.
 * Mind Gem – Near-limitless psionic/psychic abilities including empathy, telepathy and telekinesis.

The power gem is the orb (confirmed)

The time gem hasn't been revealed yet that I know of

The space gem is the tesseract (confirmed)

The soul gem is the Aether (speculation)

The reality gem hasn't been revealed yet that I know of

And the mind gem is the scepter (confirmed, I think)

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I also agree with Alexj98 in the sense that, the soul gem/(possibly Aether) was with the collector on Knowhere, and Adam Warlock/Magus' cocoon was, when Adam Warlock broke out he possibly could of took it with him.