Why is Ireland often called the emerald lsle?

Answer 1

I think you're confused here...

Ireland is called the Emerald Isle, because its really green out in the countryside. This is mainly because it rains A LOT! Iceland is called Iceland, because its cold.

Answer 2

Ireland is called the emerald isle due to year round rainfall. It allows plants to grow year round, this makes the countryside look very green. Emeralds are also green, people made a comparison that the land was always green much like how an emerald is green.