Lúmen

The Lúmen is a currency used only in Silvaryn, made of a fine green iron material unique to the elvish lands.

Each coin has a meaning, the High Lúmen carrying the highest value, makes reference to the wise High Elves of the north and their luxurious homes in Lyfondorel.

The Moon Lúmen, since it's the most common found coin, makes a reference to the most important symbol of the elven culture, the moon.

The Leaf Lúmen makes reference to the leaves of a tree, not just because they are important for the elves, but because they make part of a bigger organism and are still important to the grand scheme of things.