Emerald vs Ruby
Emerald and Ruby are both birthstone gems often compared by jewelry buyers. Ruby has a Mohs hardness of 9.0 compared to Emerald at 7.5, making Ruby the more durable option. Emerald is typically investment-grade while Ruby is investment-grade.
| Property | Emerald | Ruby |
|---|---|---|
| Category | Precious Gems | Precious Gems |
| Primary Color | green | red |
| Mohs Hardness | 7.5–8.0 | 9.0 |
| Specific Gravity | 2.67 | 3.97 |
| Refractive Index | 1.565 | 1.762 |
| Crystal System | Hexagonal | Trigonal |
| Luster | — | — |
| Chemical Formula | — | — |
| Price Tier | Investment ($5,000+/ct) | Investment ($5,000+/ct) |
| Daily Wear | Yes | Yes |
Key Differences
- ◆ {'gem_a': '7.5', 'gem_b': '9.0', 'property': 'Hardness (Mohs)'}
- ◆ {'gem_a': 'Hexagonal', 'gem_b': 'Trigonal', 'property': 'Crystal System'}
- ◆ {'gem_a': '2.67', 'gem_b': '3.97', 'property': 'Specific Gravity'}
- ◆ {'gem_a': '1.565', 'gem_b': '1.762', 'property': 'Refractive Index'}
- ◆ {'gem_a': 'N/A', '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 Emerald
Choose Emerald when you want its significance as the modern May birthstone. It's ideal for engagement rings and everyday jewelry.
When to choose Ruby
Choose Ruby when you want superior hardness and scratch resistance, higher brilliance and light performance, and its significance as the modern July birthstone. It's ideal for engagement rings and everyday jewelry.
Frequently Asked Questions
Which is harder, Emerald or Ruby?
Ruby is harder at 9.0 on the Mohs scale, compared to Emerald at 7.5-8.0. This makes Ruby more resistant to scratching. Ruby is suitable for daily wear, while emerald is suitable for daily wear.
Is Emerald more expensive than Ruby?
Emerald and Ruby are in a similar price range, both classified as investment-grade ($5,000+/ct). Emerald typically ranges investment-grade ($5,000+/ct), while Ruby ranges investment-grade ($5,000+/ct).
Should I choose Emerald or Ruby for an engagement ring?
Both Emerald and Ruby can work for engagement rings since both are suitable for daily wear. Ruby has a slight edge with a durability rating of 10/10 with 9.0 Mohs hardness, while Emerald comes in at 7.5-8.0 Mohs. Your choice may come down to color preference and budget.
How can I tell Emerald and Ruby apart?
There are several visual cues: Emerald typically appears green while Ruby is red; Ruby (RI 1.762-1.778) shows more brilliance than Emerald (RI 1.565-1.602); they have different crystal systems — Emerald is Hexagonal and Ruby is Trigonal. A gemologist can confirm identification using refractive index testing.
Can I use Emerald instead of Ruby as a birthstone?
Emerald is the modern May birthstone while Ruby is the modern July birthstone. While you can certainly wear any gemstone you prefer, they represent different months. Emerald could be a stylish alternative if you prefer its appearance or price point.