Aquamarine vs Sapphire
When choosing between Aquamarine and Sapphire — two popular gemstones that share a similar color palette — consider that Aquamarine has a hardness of 7.5 Mohs and is moderately priced, while Sapphire has a hardness of 9.0 Mohs and is investment-grade.
| Property | Aquamarine | Sapphire |
|---|---|---|
| Category | Semi-Precious Gems | Precious Gems |
| Primary Color | blue | blue |
| Mohs Hardness | 7.5–8.0 | 9.0 |
| Specific Gravity | 2.66 | 3.95 |
| Refractive Index | 1.57 | 1.762 |
| Crystal System | Hexagonal | Trigonal |
| Luster | — | rutile |
| Chemical Formula | — | — |
| Price Tier | Moderate ($50-500/ct) | Investment ($5,000+/ct) |
| Daily Wear | Ja | Ja |
Key Differences
- ◆ {'gem_a': '7.5', 'gem_b': '9.0', 'property': 'Hardness (Mohs)'}
- ◆ {'gem_a': 'Hexagonal', 'gem_b': 'Trigonal', 'property': 'Crystal System'}
- ◆ {'gem_a': '2.66', 'gem_b': '3.95', 'property': 'Specific Gravity'}
- ◆ {'gem_a': '1.57', 'gem_b': '1.762', 'property': 'Refractive Index'}
- ◆ {'gem_a': 'N/A', 'gem_b': 'rutile', 'property': 'Luster'}
- ◆ {'gem_a': 'moderate', 'gem_b': 'investment', 'property': 'Price Range'}
- ◆ {'gem_a': 'Yes', 'gem_b': 'Yes', 'property': 'Daily Wear'}
When to choose Aquamarine
Choose Aquamarine when you want a more budget-friendly price point, and its significance as the modern March birthstone. It's ideal for engagement rings and everyday jewelry.
When to choose Sapphire
Choose Sapphire when you want superior hardness and scratch resistance, higher brilliance and light performance, premium quality and rarity, and its significance as the modern September birthstone. It's ideal for engagement rings and everyday jewelry.
Frequently Asked Questions
Which is harder, Aquamarine or Sapphire?
Sapphire is harder at 9.0 on the Mohs scale, compared to Aquamarine at 7.5-8.0. This makes Sapphire more resistant to scratching. Sapphire is suitable for daily wear, while aquamarine is suitable for daily wear.
Is Aquamarine more expensive than Sapphire?
No, Aquamarine is generally less expensive. Aquamarine is classified as moderately priced ($50-500/ct) at moderately priced ($50-500/ct), while Sapphire is investment-grade ($5,000+/ct) at investment-grade ($5,000+/ct).
Should I choose Aquamarine or Sapphire for an engagement ring?
Both Aquamarine and Sapphire can work for engagement rings since both are suitable for daily wear. Sapphire has a slight edge with a durability rating of 10/10 with 9.0 Mohs hardness, while Aquamarine comes in at 7.5-8.0 Mohs. Your choice may come down to color preference and budget.
How can I tell Aquamarine and Sapphire apart?
There are several visual cues: both appear blue, but often in different saturations; Sapphire (RI 1.762-1.788) shows more brilliance than Aquamarine (RI 1.57-1.592); they have different crystal systems — Aquamarine is Hexagonal and Sapphire is Trigonal. A gemologist can confirm identification using refractive index testing.
Why do Aquamarine and Sapphire look similar?
Aquamarine and Sapphire look similar because both gems display blue hues.