Iolite 4mm Microfaceted Round A Grade - 15-16 Inch Cantera Opal Iolite most commonly occurs in

Iolite most commonly occurs in shades of blue to gray

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the third to hardest common natural gemstone

Once cooled

Iolite 4mm Microfaceted Round A Grade - 15-16 Inch Cantera Opal Iolite most commonly occurs inIolite most commonly occurs in shades of blue to gray, violet or indigo. It displays a visual property called pleochroism, which means that it can appear to be different colors as it shifts in the light. According to Norse legend, Viking explorers used thin pieces of Iolite as the worlds first polarizing lens to help them determine the exact location of the sun for navigation.