For generations, the diamond solitaire defined the engagement ring. Now, couples are choosing stones that reflect their unique story. But beyond beauty, an engagement ring must endure a lifetime of wear.  In this article, we reveal the most brilliant and resilient gems for your forever piece.

Understanding the “Forever Factor”: The Mohs Hardness Scale

Before you fall in love with a beautiful, soft gem, you need a quick lesson in geology. Engagement rings are subjected to daily bumps, bangs, and scrapes. In simple terms, they need to be hard.

The Mohs Hardness Scale measures a mineral’s resistance to scratching, ranking stones from 1 (softest, like Talc) to 10 (hardest, like Diamond).

For a stone to be suitable for daily, long-term wear in an engagement ring, we highly recommend a hardness of 8 or higher.

The Top 8 Gemstones for Engagement Rings

The Unbreakable Champions (Mohs 9–10)

These stones offer maximum durability and are built to last several lifetimes. If you have an active lifestyle, work with your hands, or simply want a worry-free ring, start here.

1. Diamond (Mohs 10)

There’s a reason diamonds are the traditional choice: they are the hardest natural substance on earth. A diamond can only be scratched by another diamond.

• Pros: Unmatched brilliance, resilience, and symbolic weight. It requires minimal daily maintenance.
• Cons: Highest price point. Traditional mining practices are a concern for some buyers.
• Modern Alternative: Lab-Grown Diamonds are chemically, physically, and optically identical to mined diamonds, but often cost 30-40% less and are guaranteed ethical.

2. Moissanite (Mohs 9.25)

Moissanite is quickly becoming the most popular diamond alternative for its incredible sparkle and exceptional durability. Nearly as hard as a diamond, it is extremely scratch-resistant.

• Pros: Outstanding fire (it refracts light more than a diamond, leading to a dazzling rainbow effect). Excellent durability for daily wear. Significantly more affordable than diamonds.
• Cons: Some people find the intense “rainbow fire” too much compared to the classic, icy white sparkle of a diamond.
• Verdict: If you prioritize ethical sourcing, high brilliance, and affordability without sacrificing durability, Moissanite is the ultimate choice.

3. Sapphire & Ruby (Mohs 9)

Sapphires and Rubies both belong to the mineral family Corundum (Sapphires are all colors except red; Rubies are exclusively red Corundum). They are the hardest stones available after diamonds and moissanite.

• Pros: Exceptional hardness (will not scratch easily). Widely available in a dazzling array of colors (blue, yellow, pink, green, and the highly sought-after Padparadscha orange-pink). Rubies offer a fiery, unique alternative to a white stone.
• Cons: Natural inclusions can sometimes make the stone appear less clear than a diamond.
• Verdict: A classic, regal choice. Sapphires have historical significance (Kate Middleton’s famous ring) and offer a stunning burst of color guaranteed to endure.

4. Alexandrite  (Mohs 8.5)

Alexandrite is one of the rarest gemstones in the world, often described by gemologists as “emerald by day, ruby by night.”

• Pros: Unparalleled Uniqueness, no other gemstone offers such a distinct and dramatic color change. It’s a conversation starter and a constant source of wonder.
• Cons:  The intensity of the color change can vary, and some people might prefer a stone with a more consistent hue if they aren’t fond of the purplish-red under certain lights.
• Setting Tip: It benefits greatly from a protective setting, such as a bezel or halo, to ensure longevity.

The Magnificent Classics (Mohs 7.5–8)

These stones are stunning, but require a bit more attention and thought regarding the ring setting chosen to protect them. They are generally suitable for daily wear if the wearer is mindful.

4. Emerald (Mohs 7.5–8)

Emeralds are known for their magnificent, deep green hue, symbolizing renewal and growth.

• Pros: Unique, instantly recognizable color. Sophisticated and highly sought after.
• Cons: While hard, Emeralds are known to be brittle. They often contain natural internal fractures (called inclusions or jardin—the French word for garden). This makes them prone to chipping if knocked hard.
• Setting Tip: If you choose an emerald, opt for a protective setting like a bezel (which wraps metal around the entire edge) or a halo setting.

5. Aquamarine (Mohs 7.5–8)

A gorgeous pale blue sister of the Emerald (both are Beryl minerals), Aquamarine offers a breathtaking, watery hue.

• Pros: Beautiful, calming color. Durable enough for daily wear with care.
• Cons: Like Emeralds, they can be brittle. Due to their pale color, scratches or cloudiness from soap/lotion build-up can be more visible than on a deeper colored stone.

The Trending Beauties (Use Caution)

These stones are hugely popular on social media due to their soft, romantic tones, but professionals often recommend them for cocktail rings or pendants, not necessarily for a ring you wear 24/7 for the next 50 years.

6. Morganite (Mohs 7.5–8)

Morganite, the pink variety of Beryl, is beloved for its soft peachy-pink color.

• The Durability Caveat: While a 7.5 on the Mohs scale seems decent, Morganite is highly sensitive to dirt and oil. It can quickly look cloudy and dull, requiring frequent cleaning (often weekly) to maintain its pastel sparkle.

What Stones Shouldn’t Be Used for Engagement Rings

For an engagement ring, yes. We generally advise against stones that fall below a Mohs 7, even if they are incredibly tempting. Stones like Opals (5.5–6.5), Pearls (2.5–4.5), and Moonstone (6–6.5) can be easily scratched, chipped, or damaged by common household items, chemicals, or even hard tap water.

Choose Your Forever Stone

The “best” stone for your engagement ring is the one that best reflects your life and your love story.

1. If you are highly active and want zero maintenance: Stick to Diamond, Moissanite, or Sapphire/Ruby.
2. If you love color and are comfortable being a little careful: Choose Emerald or Aquamarine set in a protected style.
3. If you choose a softer stone (like Morganite): Be prepared for frequent cleaning and consider removing the ring for chores, exercise, and sleep.

The perfect engagement ring stone is out there—and it’s waiting to symbolize your unique, enduring love.

More Jeulia Post:

Finding Your Forever: A Guide to Choosing the Perfect Wedding Ring for Women

Prong vs. Bezel: Choosing the Right Engagement Ring Setting for Your Sparkle

6-Prong Engagement Rings vs 4-Prong