Education Centre

Education Centre


Iolite gets its name from the Greek word for violet, and like that flower, it’s cool shades range from light to dark blue and violet

It’s a transparent and translucent gem that is strongly pleochroic. From some angles, blue Iolite can actually appear colorless. Other pleochroic colors include gray, violet, or yellow. This optical property allows the gem to act as a strong light polarizing filter, a feature that Viking navigators- on overcast days, used to view the sun through a thin piece of Iolite.

General Info

Major Sources

Brazil, India, Madagascar, Namibia, Norway, Sri Lanka, Tanzania and Myanmar.


Environmental Factor


 HeatCan be damaged
 ChemicalsAttacked by acids


  • A - Eye clean; medium light to medium, grayish purple, grape colour; good cut.
  • AA - Eye clean; medium to dark grayish purple, grape color; good cut.
  • AAA - Eye clean; Very dark to vivid grayish purple, grape color; good cut.



7-7.5 on the MOHS Scale.


Toughness is fair.


Iolite is rated “fair” for everyday wear with care. Avoid exposure to heat. Contact with chemicals, and protect from scratches and harsh blows.

To clean, gently scrub with a soft toothbrush and a solution of mild dish soap and warm water.

Further care instructions