SilmarilsThe Silmarils - The Two Trees of Valinor, Telperion and Laurelin, were the glory of Aman, sung into existence by Yavanna, Queen of the Earth.  They provided light to the land in the days before the Sun and Moon came into being.  Fëanor, who was the most skilled gem master of all the Elves, sought to capture the brilliance of the trees in stone and came up with the three Silmarils (a most timely decision as we shall see).

 

"...and he pondered how the light of the trees , the glory of the Blessed Realm, might be preserved imperishable.  Then he began a long and secret labour, and he summoned all his lore, and his power, and his subtle skill; and in the end of all he made the Silmarils," ~The Silmarillion, chap. 7 (Of the Silmarils)