Regarding the original question, and wether or not there were one or two Elessars. There is never any mention in Tolkiens writings that any Elessar was destroyed in The Fall of Gondolin.
The Elessar (or both of them was great green gems/stones) which fits perfectly. Secondly in UT the Elessar is given the ability of Healing the hurts at the Havens of Sirion - Later when the Silmaril comes to the Mouth of Sirion the power of the Elessar is more or less made obsolete by the greater power of the Silmaril.
We can only assume that Earendil wore the Elessar on his voyages, as he was the rightful owner of the stone. - So the stone passed into the West. Wether it was brought back by Gandalf or if there was a second Elessar made by Celebrimbor in Eregion, we can only speculate, but they have the same features and the one seems to be a substitute of the other.
I belive that when Aragorn wants a green gem in Bilbos verse its because he knows that the Elessar has passed from Galadriel to Celebrain and then to Arwen, his love.
Thirdly, the use of the word Emerald is, I think, a choise JRRT made to illustrate a green gem to the reader, nothing more.
... my thoughts, cheers T
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Anar Kaluva Tielyanna.
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