Iolite Gemstone Information Information * Loose gemstones * Jewelry links Iolite is the gemstone representing the 21st wedding anniversary. The name is derived from the Greek word ios, meaning "violet." Iolite is known as the gemstone of clear vision. It was believed to have the power to guide lost sailors to the brilliance of the sun in order to find their way home. View examples of cut iolite below and prices in our store section.   ENHANCEMENT CODE N Click to view AGTA code. PROPERTIES Refractive Index 1.542-1.551 Hardness = 7-7.5 (Moh's Scale) Specific Gravity = 2.61 Species - Iolite Optic Character - Double Refraction. Phenomena - Rare WARNINGS FOR CARE Ultrasonic: Risky Steamer: Risky Heat: Fusible Chemicals that harm: Acids   Crystal Structure Crystal system: Orthorhombic short prisms. MAJOR SOURCES India, Tanzania, Brazil, Sri Lanka, Madagascar, Namibia, Myanmar Birthstones  January  Garnet February Amethyst March Aquamarine April Diamond May Emerald June Pearl/Alexandrite July Ruby August Peridot September Sapphire October Opal/Tourmaline November Topaz or Citrine December Blue Topaz or Zircon Marquise cut.   Emerald cut. Oval shape. Pear shape. Round cut. Square cuts. Step cut. - Straight baguette.   Trillion cut. Heart shape.   Modified step cut.

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