Ruby & Sapphire Engagement Rings: The Colored Gemstone Buyer's Guide (2026)
Posted by SEGAL JEWELRY
Last updated: June 2026 · Reviewed by the Segal Jewelry design team · Handcrafted in the USA
Ruby and sapphire engagement rings are the most durable colored-gemstone alternatives to a diamond. Both are varieties of the mineral corundum and rank 9 on the Mohs hardness scale — second only to diamond and moissanite — making them excellent for everyday wear. Ruby is red corundum; sapphire is corundum in every other color, most famously blue.
Ruby vs. sapphire: they're the same mineral
Ruby and sapphire are both corundum. The only difference is color: when corundum is red, it's called a ruby; in any other color (blue, pink, yellow, green, white), it's a sapphire. That shared chemistry is why both share the same exceptional hardness and suitability for engagement rings.
| Ruby | Sapphire | |
|---|---|---|
| Mineral | Corundum | Corundum |
| Color | Red | Blue (and all non-red colors) |
| Hardness (Mohs) | 9 | 9 |
| Symbolism | Passion, love, vitality | Loyalty, wisdom, faithfulness |
| Birthstone | July | September |
Are ruby and sapphire good for engagement rings?
Yes — both are among the best gemstone choices for daily-wear rings. At 9 on the Mohs scale they resist scratching far better than emerald (7.5–8) or most other colored stones, and they have no cleavage planes that make them prone to chipping. They hold up to decades of daily wear with basic care.
How to choose a ruby
For rubies, color is everything. The most prized color is a vivid, pure red sometimes called "pigeon's blood." Evaluate:
- Color — Vivid, saturated red; avoid stones that look brownish, orange, or pink (a pink "ruby" may actually be classified as a pink sapphire).
- Clarity — Some inclusions are normal; eye-clean stones command a premium.
- Origin and treatment — Most rubies are heat-treated to improve color, which is standard and accepted. Untreated stones are rarer and pricier.
- Carat — Large, high-color rubies are rarer than diamonds of the same size and rise steeply in price.
How to choose a sapphire
Blue sapphires are graded primarily on color (a vivid, medium-to-deep "royal" or "cornflower" blue is most valued), then clarity, cut, and carat. Sapphires also come in pink, yellow, white, green, and the rare color-changing and padparadscha (pink-orange) varieties — giving you far more options than a single blue stone.
Best settings for ruby and sapphire engagement rings
| Setting | Why it works |
|---|---|
| Halo | A diamond halo intensifies the center stone's color and adds sparkle |
| Three-stone | Colored center with white diamond sides for high contrast |
| Solitaire | Lets a vivid stone stand alone; durable enough thanks to 9 Mohs hardness |
| Vintage / milgrain | Complements the classic, regal associations of ruby and sapphire |
Natural vs. lab-grown ruby and sapphire
Lab-grown (lab-created) rubies and sapphires are chemically and optically identical to natural ones and cost a fraction of the price, with cleaner clarity and consistent color. Natural stones carry rarity and heirloom value. Both are genuine ruby and sapphire — the difference is origin and price.
Caring for ruby and sapphire rings
- Safe to clean with warm soapy water and a soft brush; usually safe in ultrasonic cleaners (avoid if the stone is fracture-filled — ask your jeweler).
- Far more scratch-resistant than emerald or opal, but still remove for heavy impact activities.
- Have prongs inspected annually.
Frequently asked questions
Are ruby and sapphire durable enough for an engagement ring? Yes. Both are corundum and rank 9 on the Mohs hardness scale, second only to diamond and moissanite. They have no cleavage and resist scratching, making them among the best colored gemstones for everyday engagement rings.
Is a ruby more expensive than a sapphire? Often, yes. Fine-quality rubies in vivid red are rarer than blue sapphires and can command higher prices per carat. However, exceptional sapphires (such as Kashmir blue) can also be extremely valuable.
What is the difference between a ruby and a sapphire? They are the same mineral, corundum. Red corundum is called ruby; corundum of any other color is called sapphire. They share the same hardness and durability.
Should I choose a natural or lab-grown ruby or sapphire? Choose lab-grown for cleaner clarity, vivid color, and much lower cost; choose natural for rarity and heirloom value. Both are real ruby or sapphire.
What does a ruby engagement ring symbolize? Rubies symbolize passion, love, and vitality, which makes them a meaningful choice for an engagement ring. Sapphires symbolize loyalty, faithfulness, and wisdom.
Segal Jewelry handcrafts custom ruby, sapphire, and colored-gemstone engagement rings with conflict-free stones, lifetime warranty, and free worldwide shipping. Explore ruby engagement rings and sapphire engagement rings.
Explore more colored gemstone engagement rings
Ruby and sapphire are just the start. If you're drawn to color, compare them with our other colored-stone collections: emerald engagement rings, tanzanite engagement rings, aquamarine engagement rings, morganite engagement rings, and amethyst engagement rings.
