Iolite is a popular and interesting gemstone. It has a pretty violet/blue color that is different from all other gemstones. It is sometimes referred to as "the water sapphire". Although the color is similar to tanzanite, it is one of the more affordable gemstones. Its hardness is 7 - 7.5 on the mohs scale, making it very wearable for jewelry. The refractive index is 1.52 to 1.57 with an orthorhombic crystal system. The major sources of quality iolite gemstones come from Sri Lanka, India, Madagascar and Burma. More information on iolite is available here. To view our finished iolite jewelry, click here.