Iolite vs Tanzanite: What’s the Difference Between These Stunning Gemstones?
When it comes to choosing between iolite and tanzanite, many jewelry lovers find themselves unsure.
In short: Iolite (Mohs 7-7.5) and tanzanite (Mohs 6.5-7) both show blue-violet color and strong trichroism, but tanzanite is rarer, costlier, and softer. Iolite stays steady at $50-$300 per carat for fine 1.00ct stones; tanzanite AAA grade runs $600-$1,200. Tanzanite comes only from Tanzania; iolite from India, Madagascar, and Brazil. Choose tanzanite for value-retention, iolite for everyday wear.
Both gemstones showcase stunning blue and violet hues, making them popular options for all kinds of fine jewelry.
But even though they may look somewhat alike, iolite and tanzanite are very different in terms of their origin, composition, durability, and overall value.
Let’s break it all down so you can decide which gemstone is right for you.
Origins and Discovery
Iolite has a fascinating history that stretches back centuries.
Legend has it that Viking navigators used thin slices of iolite as a polarizing filter to help locate the sun on cloudy days.
Today, it’s primarily mined in places like India, Sri Lanka, Brazil, and Madagascar.
Tanzanite, on the other hand, was only discovered in the 1960s.
It comes from just one place in the world—near Mount Kilimanjaro in Tanzania—which is part of what makes it so rare and coveted.
Color Variations and Pleochroism
Both iolite and tanzanite are pleochroic, meaning they display different colors when viewed from different angles.
