Amethyst vs Diamond
Comparing Amethyst and Diamond — two gemstones frequently compared on price and value. On the Mohs scale, Amethyst rates 7.0 and Diamond rates 10.0. In terms of price, Amethyst falls in the moderately priced range and Diamond in the investment-grade range.
| Property | Amethyst | Diamond |
|---|---|---|
| Category | Semi-Precious Gems | Precious Gems |
| Primary Color | purple | various |
| Mohs Hardness | 7.0 | 10.0 |
| Specific Gravity | 2.65 | 3.5 |
| Refractive Index | 1.544 | 2.417 |
| Crystal System | Trigonal | Isometric |
| Luster | — | Adamantine,Greasy |
| Chemical Formula | — | — |
| Price Tier | Moderate ($50-500/ct) | Investment ($5,000+/ct) |
| Daily Wear | Ja | Ja |
Key Differences
- ◆ {'gem_a': '7.0', 'gem_b': '10.0', 'property': 'Hardness (Mohs)'}
- ◆ {'gem_a': 'Trigonal', 'gem_b': 'Isometric', 'property': 'Crystal System'}
- ◆ {'gem_a': '2.65', 'gem_b': '3.5', 'property': 'Specific Gravity'}
- ◆ {'gem_a': '1.544', 'gem_b': '2.417', 'property': 'Refractive Index'}
- ◆ {'gem_a': 'N/A', 'gem_b': 'Adamantine,Greasy', 'property': 'Luster'}
- ◆ {'gem_a': 'moderate', 'gem_b': 'investment', 'property': 'Price Range'}
- ◆ {'gem_a': 'Yes', 'gem_b': 'Yes', 'property': 'Daily Wear'}
When to choose Amethyst
Choose Amethyst when you want a more budget-friendly price point, and its significance as the modern February birthstone. It's ideal for engagement rings and everyday jewelry.
When to choose Diamond
Choose Diamond when you want superior hardness and scratch resistance, higher brilliance and light performance, premium quality and rarity, and its significance as the modern April birthstone. It's ideal for engagement rings and everyday jewelry.
Frequently Asked Questions
Which is harder, Amethyst or Diamond?
Diamond is harder at 10.0 on the Mohs scale, compared to Amethyst at 7.0. This makes Diamond more resistant to scratching. Diamond is suitable for daily wear, while amethyst is suitable for daily wear.
Is Amethyst more expensive than Diamond?
No, Amethyst is generally less expensive. Amethyst is classified as moderately priced ($50-500/ct) at moderately priced ($50-500/ct), while Diamond is investment-grade ($5,000+/ct) at investment-grade ($5,000+/ct).
Should I choose Amethyst or Diamond for an engagement ring?
Both Amethyst and Diamond can work for engagement rings since both are suitable for daily wear. Diamond has a slight edge with a durability rating of 10/10 with 10.0 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 Diamond apart?
There are several visual cues: Amethyst typically appears purple while Diamond is various; Diamond (RI 2.417-2.419) shows more brilliance than Amethyst (RI 1.544-1.553); they have different crystal systems — Amethyst is Trigonal and Diamond is Isometric. A gemologist can confirm identification using refractive index testing.
Is Diamond worth the price difference over Amethyst?
There is a significant price gap: Diamond is investment-grade ($5,000+/ct) (investment-grade ($5,000+/ct)) while Amethyst is moderately priced ($50-500/ct) (moderately priced ($50-500/ct)). If you want the prestige and rarity, Diamond is worth it; for a visually similar gem at a fraction of the cost, Amethyst is a smart choice.