Iolite 7x8mm Faceted Round Nugget - 15-16 Inch Agatized Coral The most precious Fire Opal

The most precious Fire Opal has flashes of iridescence and is known as Precious Fire Opal or “Firmament Stone

Mexican Laguna Lace Agate is one of the most prized agates in the world

It is opaque

8-9 small ranging 15-20mm

It often also occurs with colors of rust

Iolite 7x8mm Faceted Round Nugget - 15-16 Inch Agatized Coral The most precious Fire OpalIolite 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.