| Property | Amethyst | Spinel |
|---|---|---|
| Category | Semi-Precious Gems | Semi-Precious Gems |
| Primary Color | purple | various |
| Mohs Hardness | 7.0 | 8.0 |
| Specific Gravity | 2.65 | 3.54 |
| Refractive Index | 1.544 | 1.71 |
| Crystal System | Trigonal | Isometric |
| Luster | — | Vitreous |
| Chemical Formula | — | — |
| Price Tier | Moderate ($50-500/ct) | Fine ($500-5,000/ct) |
| Daily Wear | はい | はい |
Key Differences
- ◆ {'gem_a': '7.0', 'gem_b': '8.0', 'property': 'Hardness (Mohs)'}
- ◆ {'gem_a': 'Trigonal', 'gem_b': 'Isometric', 'property': 'Crystal System'}
- ◆ {'gem_a': '2.65', 'gem_b': '3.54', 'property': 'Specific Gravity'}
- ◆ {'gem_a': '1.544', 'gem_b': '1.71', 'property': 'Refractive Index'}
- ◆ {'gem_a': 'N/A', 'gem_b': 'Vitreous', 'property': 'Luster'}
- ◆ {'gem_a': 'moderate', 'gem_b': 'fine', 'property': 'Price Range'}
- ◆ {'gem_a': 'Yes', 'gem_b': 'Yes', 'property': 'Daily Wear'}
When to choose Amethyst
より手頃な価格や2月の誕生石としての意味を重視する方にはアメシストがお勧めです。
When to choose Spinel
傷つきにくさとより高い輝きを求める方にはスピネルがお勧めです。婚約指輪や日常使いに最適です。
Frequently Asked Questions
Which is harder, Amethyst or Spinel?
Spinel is harder at 8.0 on the Mohs scale, compared to Amethyst at 7.0. This makes Spinel more resistant to scratching. Spinel is suitable for daily wear, while amethyst is suitable for daily wear.
Is Amethyst more expensive than Spinel?
No, Amethyst is generally less expensive. Amethyst is classified as moderately priced ($50-500/ct) at moderately priced ($50-500/ct), while Spinel is fine/premium ($500-5,000/ct) at fine/premium ($500-5,000/ct).
Should I choose Amethyst or Spinel for an engagement ring?
Both Amethyst and Spinel can work for engagement rings since both are suitable for daily wear. Spinel has a slight edge with a durability rating of 9/10 with 8.0 Mohs hardness, while Amethyst comes in at 7.0 Mohs. Your choice may come down to color preference and budget.
How can I tell Amethyst and Spinel apart?
There are several visual cues: Amethyst typically appears purple while Spinel is various; Spinel (RI 1.71-1.735) shows more brilliance than Amethyst (RI 1.544-1.553); they have different crystal systems — Amethyst is Trigonal and Spinel is Isometric. A gemologist can confirm identification using refractive index testing.
Why do Amethyst and Spinel look similar?
Amethyst and Spinel look similar because both can show overlapping colors — Amethyst is purple and Spinel is various.