The Crown of Gondor or Silver Crown was worn by the Kings of Gondor.
It is described as being 'shaped like the helms of the Guards of the Citadel, save that it was loftier, and it was all white, and the wings at either side were wrought of pearl and silver in the likeness of the wings of a sea-bird, for it was the emblem of kings who came over the Sea; and seven gems of adamant were set in the circlet, and upon its summit was set a single jewel the light of which went up like a flame'.
The original crown of Gondor was the battle-helmet of Isildur. This crown was used from the beginning of the Third Age until the reign of Atanatar II the Glorious, who fashioned a new jeweled crown, of silver.
It was tradition that the new king would receive the crown from his father before he died, or take it from his hands at his father's tomb. When Eärnur rode off to Minas Morgul in TA 2050, he left the crown in the lap of his father Eärnil II in the Hallows of Minas Tirith. There it remained for the next 969, years until the Crowning of King Elessar after the defeat of Sauron.