Toughness vs Hardness: Can a Diamond Break?
Diamonds are known for being the hardest natural material on Earth – but that doesn’t mean they’re indestructible. While they’re definitely resistant to scratching, diamonds can still chip, crack, or even break, given the right conditions.
To understand how and why that can happen, it’s important to know the difference between hardness and toughness. These are two different qualities that impact a diamond’s durability.
In this piece, we’ll break down how hardness, toughness, and durability work. We’ll explore what can cause damage to a diamond, and how you can protect yours for the long haul.
Hardness vs. Toughness – What’s the Difference?
When people ask “Can a diamond break?”, the answer comes down to how well the diamond handles pressure and impact. This is something that depends on more than just hardness.
Hardness is about scratch resistance. On the Mohs scale of hardness, diamonds rank a perfect 10 on the Mohs scale. This means, in essence, that they can only be scratched by another diamond. That’s why they keep their shine and polish so well.
Toughness is about how well a material stands up when it’s hit or dropped. It’s a measure of how likely it is to chip or crack under force. On that scale, diamonds are only moderately tough; they’re harder than anything else, but they can still break.
A good analogy that can illustrate this is glass vs steel. Glass is harder than steel, but steel is tougher. You can’t scratch glass with steel, but you can shatter glass with a single hit. Diamonds are kind of like that—super hard, but not unbreakable.
Why Can a Diamond Break?
The structure of a diamond plays a big role in why it can chip, fracture, or break.
Diamonds are made up of carbon atoms in a rigid crystal structure, and within that structure are natural weak spots. These spots are known as cleavage planes. If a diamond is struck at just the right angle at just the right amount of power, it can split along those lines.
Damage can happen in several ways.
A direct impact—like dropping your ring on a tile floor or banging it against a granite countertop—can cause chips or fractures.
Certain shapes with sharp or pointed edges (like princess, pear, or marquise cuts) are more vulnerable to breakage at their tips.
If the diamond has large, internal flaws, the diamond as a whole can be weaker. This holds especially true when the flaws (inclusion) sits near an edge. And if the setting itself is loose or poorly designed, the diamond becomes even more exposed to damage during everyday wear.
So, while diamonds are definitely strong enough for daily life, they’re not invincible. The right shape, setting, and care can make all the difference.
Which Diamond Shapes Are More Prone to Chipping?
Due to their geometry, some diamond shapes are naturally more prone to chipping or breaking than others.
In particular, those shapes with sharp points or corners are more likely to chip if they’re not properly protected, like with a bezel.
Below are some shapes that may meed extra care:
- Princess – The square shape has pointed corners that are prone to chipping.
- Marquise – The long, narrow ends can break if hit.
- Pear – The single point makes it especially fragile.
- Heart – Both the point and the cleft area are vulnerable.
- Asscher – The open corners of this step-cut style need strong prongs.
In contrast to the above, here are some more durable shapes. Note that these shapes are rounded and don’t have any exposed corners.
- Round Brilliant – No corners; this shape handles wear well.
- Cushion – Rounded edges make it a bit more forgiving.
- Oval – Similar to round, with no sharp points.
Tip: If you go for a more delicate shape, it’s worth choosing a protective setting—like a V-prong on the tips or a bezel setting that surrounds the whole stone with metal. It’s a simple way to help your diamond stay safe.
How to Protect Your Diamond from Chipping or Breaking
Even though diamonds are strong, they’re not invincible. A few easy habits and smart choices can make a big difference in keeping your jewelry safe.
1. Choose the Right Setting
The setting you pick plays a big role in how protected your diamond is.
- Bezel settings wrap metal around the entire diamond—great for active lifestyles.
- V-prongs protect pointed shapes like marquise, pear, and princess cuts.
- Halo settings can act as a cushion, surrounding the center stone with smaller diamonds.
Choosing the right setting isn’t just about looks—it’s about durability too.
2. Take Off Your Jewelry During Certain Activities
There are times when it’s best to remove your diamond ring or earrings—especially when doing things that could lead to impact or pressure. Some examples are taking your piece off before participating in sports or high impact activities, or even when moving objects around the house.
Remember how we mentioned cleavage planes? Even a small bump can do damage if it hits the right spot, so it’s better to be safe than sorry and remove your diamond piece when appropriate.
3. Get Your Jewelry Checked Regularly
Over time, prongs can wear down and stones can loosen and have more of their corners exposed to bumps or nicks. Bringing your jewelry in for a quick check-up—once or twice a year—is an easy way to avoid major problems.
Most jewelers will check and tighten prongs as needed; it’s a small fix that can prevent a much bigger issue.
4. Store Diamonds Separately
Because diamonds are so hard, they can scratch other jewelry—or each other—if they’re stored together. To avoid that, keep each piece in its own space.
Use:
- Small pouches or bags
- Lined jewelry boxes with separate compartments
- Ring rolls or trays for better organization
It’s especially important when traveling, but also a good habit at home.
Final Thoughts
So—can a diamond break? Yes. It’s rare, but it happens; and understanding why can help you avoid it.
Diamonds are incredibly hard and will hold up beautifully against scratches. But they’re not unbreakable; their internal structure, shape, and setting all influence how well they handle impact. With a little care and attention, though, your diamond can last for generations.
At TeLayne Designs, we specialize in custom jewelry, so we are intimately familiar with diamonds, both lab grown and natural. We pride ourselves on helping clients choose not just the right stone, but the right setting and protection for their lifestyle. Whether you’re designing a custom engagement ring or looking for ways to care for a diamond you already own, we’re here to help. Drop by our studio today to see why we’ve become Dallas’ preferred custom jewelry destination.