Creator of Elessar (first)

There was in Gondolin a jewel-smith named Enerdhil, the greatest of that craft among the Noldor after the death of Fëanor. Enerdhil loved all green things that grew, and his greatest joy was to see the sunlight through the leaves of trees. And it came into his heart to make a jewel within which the clear light of the sun should be imprisoned, but the jewel should be green as leaves.
And he made this thing, and even the Noldor marvelled at it. For it is said that those who looked through this stone saw things that were withered or burned healed again or as they were in the grace of their youth, and that the hands of one who held it brought to all that they touched healing from hurt. This gem Enerdhil gave to Idril the King's daughter, and she wore it upon her breast; and so it was saved from the burning of Gondolin.
...
But he [Celebrimbor] did not say to Galadriel that be himself was of Gondolin long ago, and a friend of Enerdhil, though his friend in most things outrivalled him. Yet if Enerdhil had not been then Celebrimbor would have been renowned. Therefore he took thought, and began a long delicate labour, and so for Galadriel he made the greatest of his works (save the Three Rings only). And it is said that more subtle and clear was the green gem that he made than that of Enerdhil, but yet its light had less power. For whereas that of Enerdhil was lit by the Sun in its youth, already many years had passed ere Celebrimbor began his work, and nowhere in Middle-earth was the light as clear as it had been, for though Morgoth had been thrust out into the Void and could not enter again, his far shadow lay upon it. Radiant nonetheless was the Elessar of Celebrimbor; and he set it within a great brooch of silver in the likeness of an eagle rising upon outspread wings." Wielding the Elessar all things grew fair about Galadriel, until the coming of the Shadow to the Forest.

(UT, THE HISTORY OF GALADRIEL AND CELEBORN and of Amroth King of Lórien; Elessar)