Significance of the green stone?

[Lostgaeriel]

Voralphion - Thanks! I had forgotten that passage in The Battle of the Pelennor Fields.

But before all went Aragorn with the Flame of the West, Andúril like a new fire kindled, Narsil re-forged as deadly as of old; and upon his brow was the Star of Elendil.

But where did Aragorn get the Elendilmir? Has he been carrying it all along or did Elrond send it along with the standard of Arwen and his 'Paths of the Dead' reminder? And is Aragorn really entitled to wear it before Sauron is defeated and the kingdom of Arnor is restored?

So the Elendilmir must be the piece of Elvish glass to which the Mouth of Sauron is referring. Aragorn must have worn it when he looked into the palantír to add to the intimidation/shock factor and he would continue to wear it into battle - at Pelennor and at the Black Gates.

Sorry, Firefoot - we're digressing from the topic - the significance of the green stone.