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Lab grown diamonds have gained popularity among jewelry buyers because they offer the same basic diamond structure, impressive brilliance, and long-lasting durability as traditionally mined diamonds. However, as more people choose lab created diamond jewelry for engagement rings and everyday wear, a common question appears:

Can lab grown diamonds develop internal cracks over time?

The short answer is that a properly grown and well-maintained lab grown diamond does not normally develop new internal cracks simply because of age. However, like all diamonds, lab grown diamonds can contain internal characteristics from the growth process, and they can be damaged by severe impact under certain conditions.

Understanding the difference between natural internal features, growth-related characteristics, and actual damage can help buyers better care for their jewelry.

What Are Internal Cracks in a Diamond?

Before discussing lab grown diamonds specifically, it is important to understand what people mean by “internal cracks.”

In the jewelry industry, internal features may include:

• Inclusions

• Growth patterns

• Internal graining

• Feather-like characteristics

• Structural irregularities

Some of these features form while the diamond is created. They are not necessarily signs of weakness or future damage.

A true crack, however, usually refers to a break or fracture within the diamond structure caused by stress or impact.

When buyers ask whether a lab grown diamond can crack internally, they are often concerned about whether the stone can deteriorate naturally over time. In normal conditions, diamonds do not gradually develop cracks simply from aging.

Do Lab Grown Diamonds Crack Over Time?

Generally, no.

A high-quality lab grown diamond is made from crystallized carbon and has the same fundamental crystal structure as a natural diamond. It does not become weaker simply because it was created in a laboratory.

However, a lab grown diamond can experience damage if it is exposed to:

• Strong physical impact

• Sharp blows against hard surfaces

• Existing structural weaknesses

• Poorly protected settings

• Extreme stress during improper handling

The important distinction is that time itself does not cause diamond cracking. Damage usually occurs because of an external event or a specific vulnerability within the gemstone.

Can Lab Grown Diamonds Have Internal Imperfections?

Yes.

Like natural diamonds, lab grown diamonds can have internal characteristics created during their formation.

The two most common production methods are:

• CVD (Chemical Vapor Deposition)

• HPHT (High Pressure High Temperature)

Each method creates diamonds under controlled laboratory conditions, but the growth environment can influence the stone's internal characteristics.

These features may include:

• Growth layers

• Metallic inclusions

• Internal strain patterns

• Minor imperfections

This does not mean the diamond is poor quality. Many high-quality lab grown diamonds receive excellent grading results despite having microscopic internal characteristics.

Do CVD and HPHT Lab Diamonds Have Different Crack Risks?

Both CVD and HPHT diamonds are genuine diamonds and can be durable choices for jewelry.

However, their growth methods may produce different types of internal characteristics.

CVD Lab Diamond Characteristics

CVD diamonds are grown layer by layer in a controlled chamber. Some stones may show growth-related patterns or strain that professionals examine during grading.

HPHT Lab Diamond Characteristics

HPHT diamonds are created under high-pressure and high-temperature conditions. Some may contain metallic inclusions or growth features related to the manufacturing process.

For everyday jewelry use, the overall quality of the individual diamond matters more than whether it was created through CVD or HPHT technology.

A well-cut, properly graded diamond from either process can provide excellent durability.

Are Lab Grown Diamonds More Fragile Than Natural Diamonds?

No.

One common misconception is that laboratory-created diamonds are somehow weaker than natural diamonds.

This is not accurate.

Both lab grown diamonds and natural diamonds:

• Have the same carbon crystal structure

• Have similar hardness characteristics

• Can provide excellent durability for jewelry use

The risk of cracking depends more on factors such as:

• Diamond shape

• Cut style

• Internal characteristics

• Setting protection

• Daily wear habits

A lab grown diamond is not automatically more likely to crack simply because it was created in a laboratory.

Why Can Diamonds Crack Despite Being Extremely Hard?

Diamond is known as one of the hardest natural materials, but hardness does not mean complete resistance to damage.

Hardness refers to resistance against scratching.

Toughness refers to resistance against breaking or chipping.

A diamond can resist scratches extremely well but still be vulnerable to a strong impact in certain areas.

For example:

• Sharp corners may be more exposed

• Thin edges may require protection

• Certain cuts may concentrate stress in specific areas

This is why diamond shape and setting design are important considerations for everyday jewelry.

Which Lab Grown Diamond Shapes Are More Vulnerable?

Some diamond cuts require more protective settings because of their shape.

Princess Cut Lab Grown Diamonds

Princess cuts have pointed corners that can be more exposed to impact.

Protective corner prongs or a bezel setting can help reduce risk.

Pear-Shaped Lab Grown Diamonds

The pointed tip of a pear shape requires careful protection.

A secure prong at the tip is important for long-term wear.

Marquise Lab Grown Diamonds

Marquise diamonds also feature pointed ends that benefit from protective settings.

Emerald Cut Lab Grown Diamonds

Emerald cuts have larger step-cut facets that can highlight clarity characteristics, making careful selection important.

Round Brilliant Lab Grown Diamonds

Round diamonds avoid sharp corners and are often considered one of the practical choices for daily wear.

Can a Lab Grown Diamond Crack During Normal Wear?

Under normal jewelry use, a high-quality lab grown diamond is unlikely to develop an internal crack.

Daily activities such as:

• Wearing a ring

• Washing hands

• Normal office work

• Regular movement

do not typically damage a properly set diamond.

However, activities involving strong impact may increase risk.

Examples include:

• Heavy lifting

• Construction work

• Contact sports

• Using tools

• Striking hard surfaces

Removing jewelry during these activities can help protect the stone.

How Can You Check for Internal Problems in a Lab Grown Diamond?

The best way to understand a diamond's characteristics is through professional grading documentation.

A grading report can provide information about:

• Cut quality

• Color

• Clarity

• Carat weight

• Internal characteristics

Buyers should also purchase from sellers who provide reliable diamond information and transparent documentation.

A professional jeweler can examine a stone if there are concerns about:

• New visible lines

• Changes in appearance

• Loose settings

• Possible damage

Can Internal Cracks Be Repaired?

If a diamond develops damage, repair options depend on the severity and location of the issue.

Possible solutions may include:

• Re-polishing

• Re-cutting

• Resetting into a protective setting

• Replacing the stone

Because diamonds cannot simply be “filled” like some gemstones, professional evaluation is necessary.

A jeweler will determine whether repairing the diamond is practical or whether replacement is a better option.

How to Prevent Cracks in Lab Grown Diamond Jewelry

Proper care can significantly reduce the risk of damage.

Choose a Protective Setting

Settings such as bezel or secure prong designs can help protect vulnerable areas.

Avoid Strong Impacts

Remove jewelry during activities where the diamond may experience direct force.

Schedule Regular Inspections

Loose prongs or worn settings can increase the chance of damage.

Clean Jewelry Properly

Regular cleaning helps maintain brilliance while allowing you to notice potential issues early.

Store Jewelry Carefully

Avoid storing diamond jewelry where it can strike against other hard objects.

Does Certification Matter When Buying a Lab Grown Diamond?

Yes.

A grading report provides valuable information about the diamond's characteristics and helps buyers understand what they are purchasing.

When buying a lab grown diamond engagement ring, consider:

• Diamond certification

• Clarity information

• Cut quality

• Seller reputation

• Warranty and service options

A well-documented diamond gives buyers greater confidence in its quality and long-term performance.

Should Buyers Worry About Lab Grown Diamond Longevity?

For most buyers, there is little reason to worry about a high-quality lab grown diamond naturally developing cracks over time.

The more important factors are:

• Choosing a quality stone

• Selecting the right setting

• Wearing the jewelry appropriately

• Maintaining the ring regularly

With proper care, a lab grown diamond can remain bright, durable, and visually impressive for many years.

Final Thoughts

Can lab grown diamonds develop internal cracks over time?

A lab grown diamond does not normally develop internal cracks simply because it gets older. Like natural diamonds, it can have internal characteristics formed during growth, and it can be damaged by strong impacts in certain situations.

The key to long-term durability is understanding the diamond's quality, choosing an appropriate setting, and practicing proper jewelry care.

Whether created through CVD or HPHT technology, a well-made lab grown diamond can provide lasting sparkle, strength, and beauty when properly maintained.