Tree of Gold

The Tree of Gold was a living, metallic tree that formed shortly after the creation of the World of Narnia. When Andrew Ketterley accidentally stumbled into the empty world that would become Narnia – specifically the area that would later become Lantern Waste – he was carrying several gold coins in his pocket. When the half-sovereign gold coins fell into the magically imbued soil of the newly created world, they grew into a living tree made entirely of malleable gold.

Some of Narnia's first dwarfs used gold from this tree to fashion crowns for King Frank and Queen Helen, the first monarchs of Narnia.

It is not known how long the Tree of Gold stood in Narnia. By the time of The Last Battle (the only other time it was directly mentioned), it was gone from Lantern Waste, but stories about it had apparently been passed down through the centuries: King Tirian not only knew of the tree's existence, but precisely where in the woods of Lantern Waste it had once stood.

Trivia

 * The Tree of Gold, along with it's counterpart, the Tree of Silver might be reference to the Trees of Valinor (golden Laurelin and silver Telperion) that appeared in the works of C.S.Lewis' lifelong friend J.R.R.Tolkien.