It's one of the rarest types of eye color. They're most common among people of Northern European descent, because they're also genetically predisposed to produce less melanin.
Other types of rare eye colors are Red (mostly found in albinos), Violet (Red with a blue reflection), Amber, and Black (not deep brown, but black)
Depending on external factors, like distance and angle, the eyes are one of the first things you notice about someone when you first meet them. Do you have any of these colors? Let us know in the comments.