Updated as of June 2026
Iolite
Once used by Viking navigators as a polarizing filter, iolite is linked to vision, intuition, and inner guidance.
Price range$15 to $150/ct
Hardness (Mohs)7
ColorsBlue, Violet-blue, Gray
BirthstoneNone
AltGems Score How we score
6.8/10
Iolite pros and cons
Pros
- Good durability (Mohs 7) for most jewelry
- Strong value for the look
- Usually sold untreated
Cons
- Quality varies widely, so compare before buying
Iolite is ideal for earrings, pendants, and occasional-wear rings, and works in everyday rings with a protective setting.
Explore Iolite
Meaning and properties
Symbolism, zodiac, chakraPrice and value
What it costs and whyBuying guide
How to choose and where to buyCare and cleaning
Keep it looking its bestIolite jewelry
Iolite by cut
Iolite ring styles
Iolite solitaire ringIolite halo ringIolite three stone ringIolite hidden halo ringIolite vintage and antique ringIolite bezel ringAll styles
Iolite by metal
Iolite in yellow goldIolite in white goldIolite in rose goldIolite in platinumIolite in sterling silver
Common buying mistakes
- Buying on carat weight alone instead of color and cut, which drive beauty more.
- Skipping treatment disclosure, which changes both value and care.
- Overpaying at one retailer without comparing the same color and carat elsewhere.
- Cleaning it the wrong way. Reasonably durable but has cleavage. Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners and hard knocks.
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Where to buy Iolite: for fine pieces, choose established jewelers with clear return policies and lab reports; for unique or budget pieces, vetted marketplace sellers work well. Always confirm treatment and the return window before buying. AltGems prices are general per-carat guides, so verify value with a certified gemologist or GIA report.
Frequently asked questions
What is Iolite?
Once used by Viking navigators as a polarizing filter, iolite is linked to vision, intuition, and inner guidance. It rates 7 on the Mohs hardness scale and commonly appears in blue, violet-blue, gray.
How much does Iolite cost?
Iolite typically runs about $15 to $150 per carat depending on color, clarity, cut, and origin. See our Iolite price guide for detail.
Is Iolite good for everyday jewelry?
It rates 7 on the Mohs scale, so it suits earrings, pendants, and occasional-wear rings better than daily rough use.
What is the AltGems Score for Iolite?
Iolite earns an overall AltGems Score of 6.8 out of 10, balancing durability, brilliance, value, rarity, and everyday wearability. See our methodology on the How We Score page.
How do I care for Iolite?
Reasonably durable but has cleavage. Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners and hard knocks.