Updated as of June 2026
Dumortierite vs Iolite
| Dumortierite | Iolite | |
|---|---|---|
| Price / carat | $5 to $50 | $15 to $150 |
| Hardness (Mohs) | 7 | 7 |
| Color | Blue, Violet blue, Denim blue | Blue, Violet-blue, Gray |
| Treatment | Typically untreated | Typically untreated |
The bottom line
Dumortierite and Iolite 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 Dumortierite and Iolite.
Frequently asked questions
Is Dumortierite or Iolite more durable?
Both rate Mohs 7, so they are comparably durable.
Which is cheaper, Dumortierite or Iolite?
Dumortierite runs about $5 to $50 per carat and Iolite about $15 to $150 per carat, so Dumortierite is usually the more affordable choice.
Which should I choose?
Pick Dumortierite if you want blue tones and Iolite if you prefer blue. Match the stone hardness to how you will wear it and let budget break the tie.