Iolite 6x8mm Triangle Cut Faceted Rice Bead - 15-16 Inch Shape_Faceted Bicone The holes in these beads

The holes in these beads are straight

and is a result of trace amounts of copper or chromium

It ranges from almost completely transparent to an almost opaque brownish to gray crystal

Opalite is the trade name for man to made glass treated to exhibit the internal flashes of true Opals in translucent samples

including Diamond

Iolite 6x8mm Triangle Cut Faceted Rice Bead - 15-16 Inch Shape_Faceted Bicone The holes in these beadsIolite 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.