Sapphire vs Tanzanite
When choosing between Sapphire and Tanzanite — two popular gemstones that share a similar color palette — consider that Sapphire has a hardness of 9.0 Mohs and is investment-grade, while Tanzanite has a hardness of 6.5 Mohs and is moderately priced.
| Property | Sapphire | Tanzanite |
|---|---|---|
| Category | Precious Gems | Semi-Precious Gems |
| Primary Color | blue | various |
| Mohs Hardness | 9.0 | 6.5–7.0 |
| Specific Gravity | 3.95 | 3.35 |
| Refractive Index | 1.762 | 1.685 |
| Crystal System | Trigonal | Orthorhombic |
| Luster | rutile | — |
| Chemical Formula | — | — |
| Price Tier | Investment ($5,000+/ct) | Moderate ($50-500/ct) |
| Daily Wear | Yes | No |
Key Differences
- ◆ {'gem_a': '9.0', 'gem_b': '6.5', 'property': 'Hardness (Mohs)'}
- ◆ {'gem_a': 'Trigonal', 'gem_b': 'Orthorhombic', 'property': 'Crystal System'}
- ◆ {'gem_a': '3.95', 'gem_b': '3.35', 'property': 'Specific Gravity'}
- ◆ {'gem_a': '1.762', 'gem_b': '1.685', 'property': 'Refractive Index'}
- ◆ {'gem_a': 'rutile', 'gem_b': 'N/A', 'property': 'Luster'}
- ◆ {'gem_a': 'investment', 'gem_b': 'moderate', 'property': 'Price Range'}
- ◆ {'gem_a': 'Yes', 'gem_b': 'No', 'property': 'Daily Wear'}
When to choose Sapphire
Choose Sapphire when you want superior hardness and scratch resistance, higher brilliance and light performance, premium quality and rarity, suitability for daily wear, and its significance as the modern September birthstone. It's ideal for engagement rings and everyday jewelry.
When to choose Tanzanite
Choose Tanzanite when you want a more budget-friendly price point, and its significance as the modern December birthstone. It's ideal for occasional wear pieces and pendants.
Frequently Asked Questions
Which is harder, Sapphire or Tanzanite?
Sapphire is harder at 9.0 on the Mohs scale, compared to Tanzanite at 6.5-7.0. This makes Sapphire more resistant to scratching. Sapphire is suitable for daily wear, while tanzanite requires more careful handling and is not ideal for daily wear.
Is Sapphire more expensive than Tanzanite?
Yes, Sapphire is generally more expensive. Sapphire is classified as investment-grade ($5,000+/ct) with prices around investment-grade ($5,000+/ct), while Tanzanite is moderately priced ($50-500/ct) at moderately priced ($50-500/ct).
Should I choose Sapphire or Tanzanite for an engagement ring?
For an engagement ring, Sapphire is the stronger choice with a durability rating of 10/10. At 9.0 Mohs hardness, it can withstand daily wear well. Tanzanite (6.5-7.0 Mohs) is softer and more prone to scratching with everyday use, making it better suited for occasional-wear jewelry.
How can I tell Sapphire and Tanzanite apart?
There are several visual cues: Sapphire typically appears blue while Tanzanite is various; Sapphire (RI 1.762-1.788) shows more brilliance than Tanzanite (RI 1.685-1.707); they have different crystal systems — Sapphire is Trigonal and Tanzanite is Orthorhombic. A gemologist can confirm identification using refractive index testing.
Why do Sapphire and Tanzanite look similar?
Sapphire and Tanzanite look similar because both can show overlapping colors — Sapphire is blue and Tanzanite is various.