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Iolite contains magnesium, iron, aluminium and silica, and that combination gives iolite its deep violet color. In fact, iolite is pleochroic, which means it displays different colors at different angles. But wait... there's more. Vikings used iolite to determine the direction of the sun on overcast days. By turning an iolite rock against the backdrop of the sky, the rock will appear more or less translucent depending on the direction of the sun's polarized light.
So, you might be able to use these oval iolite sterling silver studs to find your way home, but maybe try your GPS first.