Iolite 8mm Round A Grade - 15-16 Inch Rainbow Sapphire according to the Mohs hardness

according to the Mohs hardness scale

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it is a form of hydrated amorphous silica

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Iolite 8mm Round A Grade - 15-16 Inch Rainbow Sapphire according to the Mohs hardnessIolite 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.