Iolite is known as the Vikings' Compass. It provides physical and spiritual mobilization and comfort. Ancient mariners and Viking explorers used Iolite as a compass to guide their travels at sea. They found that the color would vary between shades of blue and violet dependent upon their location in either the northern and southern skies. Iolite is believed to be the first polarizing filter helping explorers navigate back and forth from the New World.  This stone can range in light to dark blue colors, with the deeper colors obtaining greater value.