Iolite

Iolite

Iolite is a captivating gemstone renowned for its distinctive pleochroism and rich violet-blue hues. The name comes from the Greek word “ios”, meaning “violet”. Historically, people also identify this as the “Viking’s Compass,” as ancient mariners utilized it to navigate the seas, leveraging thin slices due to its unique optical properties to determine the sun’s position on overcast days.

Variety and Category

• Mineral Family: Cordierite (Cyclosilicate)
• Chemical Formula: Mg₂Al₄Si₅O₁₈
• Crystal System: Orthorhombic
• Mohs Hardness: 7.0 – 7.5

Iolite’s durability makes it suitable for various types of jewelry. Users should pay more attention to take care due to its perfect cleavage in one direction, which can make it susceptible to splitting if struck sharply.

Color and Value

Iolite exhibits a range of colors from violet-blue to grayish-blue, with the most prized specimens displaying a rich, saturated violet-blue hue. Its strong pleochroism causes the gemstone to show different colors—typically violet-blue, yellow-gray, and light blue—when viewed from different angles. This optical phenomenon adds to its allure and uniqueness.

Several factors influence the value of iolite:

• Color: Deep, saturated violet-blue colors are more valuable.
• Clarity: Transparent stones with minimal inclusions command higher prices.
• Cut: Precision in cutting enhances the stone’s brilliance and pleochroic display.
• Carat Weight: Larger stones are rarer and thus more valuable.

Optical Properties

• Luster: Vitreous
• Refractive Index: 1.542 – 1.551
• Birefringence: +0.045, -0.011
• Pleochroism: Strong; displays violet-blue, yellow-gray, and light blue colors

Iolite’s strong pleochroism and vitreous luster contribute to its visual appeal, making it a favored choice among gem enthusiasts.

Common Cuts and Applications of Iolite

Gem cutters typically facet Iolite into shapes such as oval, round, cushion, and emerald cuts to maximize its brilliance and showcase its pleochroic properties. Jewelers commonly use it in various types of jewelry, including rings, earrings, pendants, and bracelets. Due to its good hardness, it is suitable for daily wear, though protective settings are recommended to safeguard against potential cleavage.

Sri Lankan Uniqueness

Sri Lanka, historically known as Ceylon, is renowned for producing high-quality iolite gemstones. The country’s gem-rich regions, particularly around Ratnapura, yield iolite crystals celebrated for their exceptional clarity and vibrant colors. Notably, Sri Lankan iolite is esteemed in the global gemstone market for its superior quality and natural beauty.

At Luxiris Gems (PVT) Ltd., we take immense pride in offering authentic Sri Lankan iolite, each meticulously selected for its exceptional beauty and quality. Our commitment to ethical sourcing and excellence ensures that our clients receive gemstones that are not only stunning but also steeped in the rich heritage of Sri Lanka’s gemological legacy. Contact Luxiris Gems to find your ideal gemstone.