Iolite 4-7mm Faceted Rondelle - 18 Inch hps_07232026 Composed mostly of tiger's eye

Composed mostly of tiger's eye

and the sheets and flakes of mica are flexible

the hole size

Black Tourmaline is a black crystalline aluminum borosilicate mineral with occasional light gray inclusions that appear as flecks or veins

Iolite 4-7mm Faceted Rondelle - 18 Inch hps_07232026 Composed mostly of tiger's eyeIolite 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.