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Black Opal is a naturally occurring variety of precious opal mined in Australia
ranges in color from blue-green to green
prized throughout history for its beautiful colors and patterns
5x7 mm / 0
its variations seem to depict landscapes and other images
Iolite 6mm Round A Grade - 15-16 Inch gemstone-pendant Black Opal is a naturallyIolite 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.
