Diamond vs Ruby
Diamond and Ruby, both birthstone gems often compared by jewelry buyers, differ in hardness (10.0 vs 9.0 Mohs) and price tier (investment-grade vs investment-grade). Diamond offers greater durability for everyday wear.
| Property | Diamond | Ruby |
|---|---|---|
| Category | Precious Gems | Precious Gems |
| Primary Color | various | red |
| Mohs Hardness | 10.0 | 9.0 |
| Specific Gravity | 3.5 | 3.97 |
| Refractive Index | 2.417 | 1.762 |
| Crystal System | Isometric | Trigonal |
| Luster | Adamantine,Greasy | — |
| Chemical Formula | — | — |
| Price Tier | Investment ($5,000+/ct) | Investment ($5,000+/ct) |
| Daily Wear | Yes | Yes |
Key Differences
- ◆ {'gem_a': '10.0', 'gem_b': '9.0', 'property': 'Hardness (Mohs)'}
- ◆ {'gem_a': 'Isometric', 'gem_b': 'Trigonal', 'property': 'Crystal System'}
- ◆ {'gem_a': '3.5', 'gem_b': '3.97', 'property': 'Specific Gravity'}
- ◆ {'gem_a': '2.417', 'gem_b': '1.762', 'property': 'Refractive Index'}
- ◆ {'gem_a': 'Adamantine,Greasy', 'gem_b': 'N/A', 'property': 'Luster'}
- ◆ {'gem_a': 'investment', 'gem_b': 'investment', 'property': 'Price Range'}
- ◆ {'gem_a': 'Yes', 'gem_b': 'Yes', 'property': 'Daily Wear'}
When to choose Diamond
Choose Diamond when you want superior hardness and scratch resistance, higher brilliance and light performance, and its significance as the modern April birthstone. It's ideal for engagement rings and everyday jewelry.
When to choose Ruby
Choose Ruby when you want its significance as the modern July birthstone. It's ideal for engagement rings and everyday jewelry.
Frequently Asked Questions
Which is harder, Diamond or Ruby?
Diamond is harder at 10.0 on the Mohs scale, compared to Ruby at 9.0. This makes Diamond more resistant to scratching. Diamond is suitable for daily wear, while ruby is suitable for daily wear.
Is Diamond more expensive than Ruby?
Diamond and Ruby are in a similar price range, both classified as investment-grade ($5,000+/ct). Diamond typically ranges investment-grade ($5,000+/ct), while Ruby ranges investment-grade ($5,000+/ct).
Should I choose Diamond or Ruby for an engagement ring?
Both Diamond and Ruby 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 Ruby comes in at 9.0 Mohs. Your choice may come down to color preference and budget.
How can I tell Diamond and Ruby apart?
There are several visual cues: Diamond typically appears various while Ruby is red; Diamond (RI 2.417-2.419) shows more brilliance than Ruby (RI 1.762-1.778); they have different crystal systems — Diamond is Isometric and Ruby is Trigonal. A gemologist can confirm identification using refractive index testing.
Can I use Diamond instead of Ruby as a birthstone?
Diamond is the modern April birthstone while Ruby is the modern July birthstone. While you can certainly wear any gemstone you prefer, they represent different months. Diamond could be a stylish alternative if you prefer its appearance or price point.