Tanzanite vs Topaz
Comparing Tanzanite and Topaz — two popular gemstones that share a similar color palette. On the Mohs scale, Tanzanite rates 6.5 and Topaz rates 8.0. In terms of price, Tanzanite falls in the moderately priced range and Topaz in the fine/premium range.
| Property | Tanzanite | Topaz |
|---|---|---|
| Category | Semi-Precious Gems | Semi-Precious Gems |
| Primary Color | various | yellow |
| Mohs Hardness | 6.5–7.0 | 8.0 |
| Specific Gravity | 3.35 | 3.49 |
| Refractive Index | 1.685 | 1.606 |
| Crystal System | Orthorhombic | Orthorhombic |
| Luster | — | Vitreous |
| Chemical Formula | — | — |
| Price Tier | Moderate ($50-500/ct) | Fine ($500-5,000/ct) |
| Daily Wear | No | Yes |
Key Differences
- ◆ {'gem_a': '6.5', 'gem_b': '8.0', 'property': 'Hardness (Mohs)'}
- ◆ {'gem_a': 'Orthorhombic', 'gem_b': 'Orthorhombic', 'property': 'Crystal System'}
- ◆ {'gem_a': '3.35', 'gem_b': '3.49', 'property': 'Specific Gravity'}
- ◆ {'gem_a': '1.685', 'gem_b': '1.606', 'property': 'Refractive Index'}
- ◆ {'gem_a': 'N/A', 'gem_b': 'Vitreous', 'property': 'Luster'}
- ◆ {'gem_a': 'moderate', 'gem_b': 'fine', 'property': 'Price Range'}
- ◆ {'gem_a': 'No', 'gem_b': 'Yes', 'property': 'Daily Wear'}
When to choose Tanzanite
Choose Tanzanite when you want higher brilliance and light performance, a more budget-friendly price point, and its significance as the modern December birthstone. It's ideal for occasional wear pieces and pendants.
When to choose Topaz
Choose Topaz when you want superior hardness and scratch resistance, premium quality and rarity, suitability for daily wear, and its significance as the modern November birthstone. It's ideal for engagement rings and everyday jewelry.
Frequently Asked Questions
Which is harder, Tanzanite or Topaz?
Topaz is harder at 8.0 on the Mohs scale, compared to Tanzanite at 6.5-7.0. This makes Topaz more resistant to scratching. Topaz is suitable for daily wear, while tanzanite requires more careful handling and is not ideal for daily wear.
Is Tanzanite more expensive than Topaz?
No, Tanzanite is generally less expensive. Tanzanite is classified as moderately priced ($50-500/ct) at moderately priced ($50-500/ct), while Topaz is fine/premium ($500-5,000/ct) at fine/premium ($500-5,000/ct).
Should I choose Tanzanite or Topaz for an engagement ring?
For an engagement ring, Topaz is the stronger choice with a durability rating of 9/10. At 8.0 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 Tanzanite and Topaz apart?
There are several visual cues: Tanzanite typically appears various while Topaz is yellow; Tanzanite (RI 1.685-1.707) shows more brilliance than Topaz (RI 1.606-1.644). A gemologist can confirm identification using refractive index testing.
Why do Tanzanite and Topaz look similar?
Tanzanite and Topaz look similar because both can show overlapping colors — Tanzanite is various and Topaz is yellow.