The elfstone (Elessar) that Aragorn receives from Galadriel is not a silmaril, but another stone of high quality. The history is mixed when reading the UF and the Lost Tales. In one version, I believe, the Elessar was a gift of Celebrimbor to Galadriel. I think that there were actually two Elessars', the first being destroyed in the Fall of Gondolin, but I don't have my materials in front of me to know exactly.
I surmise that the Elessar that Aragorn receives is the second made by Celebrimbor.
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