Updated as of June 2026
Blue Topaz vs Aquamarine
| Blue Topaz | Aquamarine | |
|---|---|---|
| Price / carat | $10 to $150 | $30 to $600 |
| Hardness (Mohs) | 8 | 7.75 |
| Color | Blue, Sky blue, Deep blue | Blue, Blue-green, Pale blue |
| Treatment | Irradiation and heat (nearly all stones) | Heat treatment (to deepen blue) |
The bottom line
Blue Topaz and Aquamarine 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 Blue Topaz and Aquamarine.
Frequently asked questions
Is Blue Topaz or Aquamarine more durable?
Blue Topaz is harder (Mohs 8 vs 7.75), so it resists scratches better.
Which is cheaper, Blue Topaz or Aquamarine?
Blue Topaz runs about $10 to $150 per carat and Aquamarine about $30 to $600 per carat, so Blue Topaz is usually the more affordable choice.
Which should I choose?
Pick Blue Topaz if you want blue tones and Aquamarine if you prefer blue. Match the stone hardness to how you will wear it and let budget break the tie.