Updated as of June 2026
Iolite vs Tanzanite
| Iolite | Tanzanite | |
|---|---|---|
| Price / carat | $15 to $150 | $100 to $1,200 |
| Hardness (Mohs) | 7 | 6.5 |
| Color | Blue, Violet-blue, Gray | Blue, Violet-blue, Purple |
| Treatment | Typically untreated | Heat treatment (nearly all stones) |
The bottom line
Iolite and Tanzanite both make beautiful jewelry. Choose by the look you want first, then weigh hardness against how hard you will wear the piece, and let price settle close calls. Read the full guides for Iolite and Tanzanite.
Frequently asked questions
Is Iolite or Tanzanite more durable?
Iolite is harder (Mohs 7 vs 6.5), so it resists scratches better.
Which is cheaper, Iolite or Tanzanite?
Iolite runs about $15 to $150 per carat and Tanzanite about $100 to $1,200 per carat, so Iolite is usually the more affordable choice.
Which should I choose?
Pick Iolite if you want blue tones and Tanzanite if you prefer blue. Match the stone hardness to how you will wear it and let budget break the tie.