If you have heard about the gemstones then you must have heard about iolite. This gemstone is a variety of the cordierite and this is one of the rarest gemstone found in the world. The refractive index of this gemstone is 1.52 to 1.57 and the color displayed by this gemstone is yellowish gray to blue violet. The hardness of this gemstone is 7 to 7.5. These properties are unique and this is the reason why this gemstone is the most adored product in the market. It is very delicate and it has cleavage which is poor in one direction only.
The color is the most distinguishing aspect of the gemstone and this is somewhat similar to the blue sapphire. That is the reason why it is sometimes termed as the water sapphire. If you are thinking that you cannot afford this delicate material then you should better think again. This is because its prices are not sky touching rather lower and you can afford it easily. This gemstone possesses a rare property of pleochroism in which it displays three different colors in the same stone; it means that you can witness three different colors in the same stone.
