Black Opal vs Opal
Black Opal and Opal are both gemstones frequently compared on price and value. Black Opal has a Mohs hardness of 6.0 compared to Opal at 5.0, making Black Opal the more durable option. Black Opal is typically moderately priced while Opal is budget-friendly.
| Property | Black Opal | Opal |
|---|---|---|
| Category | Semi-Precious Gems | Semi-Precious Gems |
| Primary Color | white | white |
| Mohs Hardness | 6.0–6.5 | 5.0–6.5 |
| Specific Gravity | 1.97 | 1.98 |
| Refractive Index | 1.37 | 1.37 |
| Crystal System | Amorphous | Amorphous |
| Luster | Vitreous | — |
| Chemical Formula | — | — |
| Price Tier | Moderate ($50-500/ct) | Budget (< $50/ct) |
| Daily Wear | Nein | Nein |
Key Differences
- ◆ {'gem_a': '6.0', 'gem_b': '5.0', 'property': 'Hardness (Mohs)'}
- ◆ {'gem_a': 'Amorphous', 'gem_b': 'Amorphous', 'property': 'Crystal System'}
- ◆ {'gem_a': '1.97', 'gem_b': '1.98', 'property': 'Specific Gravity'}
- ◆ {'gem_a': '1.37', 'gem_b': '1.37', 'property': 'Refractive Index'}
- ◆ {'gem_a': 'Vitreous', 'gem_b': 'N/A', 'property': 'Luster'}
- ◆ {'gem_a': 'moderate', 'gem_b': 'budget', 'property': 'Price Range'}
- ◆ {'gem_a': 'No', 'gem_b': 'No', 'property': 'Daily Wear'}
When to choose Black Opal
Choose Black Opal when you want superior hardness and scratch resistance, and premium quality and rarity. It's ideal for occasional wear pieces and pendants.
When to choose Opal
Choose Opal when you want a more budget-friendly price point, and its significance as the modern October birthstone. It's ideal for collector specimens and carefully worn jewelry.
Frequently Asked Questions
Which is harder, Black Opal or Opal?
Black Opal is harder at 6.0-6.5 on the Mohs scale, compared to Opal at 5.0-6.5. This makes Black Opal more resistant to scratching. Black Opal requires more careful handling and is not ideal for daily wear, while opal requires more careful handling and is not ideal for daily wear.
Is Black Opal more expensive than Opal?
Yes, Black Opal is generally more expensive. Black Opal is classified as moderately priced ($50-500/ct) with prices around moderately priced ($50-500/ct), while Opal is budget-friendly (under $50/ct) at budget-friendly (under $50/ct).
Should I choose Black Opal or Opal for an engagement ring?
Neither Black Opal nor Opal is ideal for an engagement ring worn daily. Black Opal (6.0-6.5 Mohs) is the more durable of the two, while Opal (5.0-6.5 Mohs) is softer. If you choose either, consider a protective setting like a bezel.
How can I tell Black Opal and Opal apart?
There are several visual cues: both appear white, but often in different saturations. A gemologist can confirm identification using refractive index testing.
Is Black Opal worth the price difference over Opal?
Black Opal (moderately priced ($50-500/ct)) commands a moderate premium over Opal (budget-friendly (under $50/ct)). The price difference reflects differences in rarity and market demand. Both are solid choices depending on your budget and priorities.