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as well as some occurrences of dark gray
It is known for its colors -- dark green and mustardy yellow
This makes sapphires very durable and scratch-resistant
Specialists soak the stones in resin or liquid plastic to help harden them
Iolite 4mm Round A Grade - 15-16 Inch 3mm as well as some occurrencesIolite 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.
