IOLITE DEEP BLUE 1.83 CTS RARE COLLECTORS GEMSTONE – 18506

100% Natural – Not treated in any way.
Rare Collectors Gem.
Will make a Gorgeous Ring or Pendent accented with Diamonds.
Gem with High Luster and Good Clarity.
Clean Gems are rare.
Large Sizes are Extremely Rare.
A Gem of Lasting Beauty.
Iolite Gem with extreme Pleochroism. Shows different colors in different directions.

R I: 522 - 1.578
Hardness: 7 - 7.5
Chemical comp: (Mg, Fe2) Al4Si5O18
Density: 2.53 - 2.78
Crystal Group: Orthorhomic

Iolite comes in different colors in different directions in the crystal. An Iolite cube will look violet blue, like Tanzanite from one side, colorless from the other, and a yellow from top.Iolites are extremely difficult to cut- to display the best color, due to the Pleochroism When Leif Eriksson the legendary Viking explorers ventured into the Atlantic, the Viking mariners used thin pieces of it as the world\’s first polarizing filter, to determine their position for navigation. Extreme Pleochroism – is the property which made iolite so valuable to the Vikings.