Expertise you can trust: Klara Allen is known for its premium jewelry designs and seamless, innovative shopping experience. This Klara Allen diamond guide explains the difference between lab-grown and natural diamonds—how they are chemically, physically, and optically identical—yet differ in origin, rarity, and value. All Klara Allen guides are meticulously researched and reviewed by our certified gemologists, content, editorial, and brand teams before publication to ensure industry-leading excellence and accuracy. 

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What Is a Lab Grown Diamond?

Lab grown diamonds are real diamonds produced in a controlled laboratory setting. Chemically, physically, and optically, lab diamonds are identical to natural diamonds, with the same hardness, brilliance, and fire. Unlike natural diamonds that form over billions of years deep within the Earth’s mantle, lab diamonds can be created in just weeks to months.

Types of Lab Grown Diamonds

Lab grown diamonds start as tiny carbon seeds from pre-existing diamonds. There are two primary techniques used to create lab diamonds: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD).  

  • HPHT Lab Grown Diamonds: This method mimics the natural conditions under which diamonds form inside the Earth. A diamond seed is placed in a chamber and subjected to intense heat (over 2,000 degrees Celsius) and pressure (1.5 million pounds per square inch). The carbon atoms in the chamber bond with the seed, crystallizing into a diamond. 
  • CVD Lab Grown Diamonds: This method starts with a thin piece of diamond seed being placed in a vacuum chamber filled with a carbon-rich gas mixture (typically methane and hydrogen) that’s heated to break down the gas molecules. Carbon atoms settle onto the seed, building layer by layer until the diamond reaches its desired size. Some CVD diamonds undergo additional pressure and heat treatment after growth. 

Both methods simulate part of the natural diamond-forming process, resulting in high-quality diamonds that are identical to mined diamonds in every way. After several days, a rough diamond is created, then cut, polished, and set in jewelry. Both methods yield real diamonds with no differences in durability or quality, differing only in growth patterns and production time. 

With the naked eye, it’s impossible to differentiate between natural diamonds, HPHT lab diamonds, and CVD lab diamonds; only experts can identify subtle markers related to growth patterns.

Are Lab Grown Diamonds Real?

Yes, lab grown diamonds are as real as natural diamonds are. There are many misconceptions about lab diamonds, a few of the most common being:  

  • Lab diamonds are "fake" diamonds: This is untrue. Lab diamonds are chemically, physically, and optically identical to natural diamonds.  
  • Lab diamonds look different from natural diamonds: This is untrue. With the naked eye, even experts cannot distinguish lab from natural diamonds without specialized equipment. 
  • Lab diamonds aren’t as durable: This is untrue. Lab diamonds have the same hardness (10 on the Mohs scale) as natural diamonds.   
  • Lab diamonds are flawless: This is untrue. Like natural diamonds, lab diamonds can contain inclusions.  

The only real difference between lab and natural diamonds is their origin: lab diamonds are grown in laboratory settings, while natural diamonds form deep within the Earth. Otherwise, lab diamonds are identical to natural diamonds and 100% real.

Lab Grown Diamond vs. Natural

Here’s how a lab grown diamond and a natural diamond compare:

Lab Diamond Natural Diamond
Durability 10 on the Mohs scale 10 on the Mohs scale
Brilliance Refractive index ranges from 2.417 to 2.419 Refractive index ranges from 2.417 to 2.419
Color Primarily colorless, but can also occur in many color options that are often more vivid than natural options Primarily colorless, but can also occur in many color options including pink, blue, and yellow
Grading Graded on cut, color, clarity, and carat Graded on cut, color, clarity, and carat
Certification Certified by reputable gemological institutions Certified by reputable gemological institutions
Origin Grown in controlled laboratories over several days to weeks, then cut and polished Formed deep in Earth over billions of years, mined, cut, and polished
Rarity Can be produced in increasing quantities as technology advances Limited quantities based on geological conditions
Price Lower cost due to availability Higher cost due to mining and rarity

Can You Tell the Difference Between Lab Grown and Natural Diamonds?

To the naked eye, lab grown and natural diamonds are indistinguishable. Only gemologists can detect the following minor differences using specialized, high magnification equipment:  

  • Internal Growth Patterns: lab diamonds may exhibit growth patterns that slightly differ from the octahedral growth pattern in natural diamonds.  
  • Inclusions: Natural diamonds often contain inclusions from natural minerals, while lab diamonds may contain metallic inclusions or other markers related to the HPHT or CVD growth process.  
  • Laser Inscription: Most lab diamonds are inscribed on the girdle with a microscopic mark indicating their lab origin. 

Do you think you can tell the difference between lab grown and natural diamonds just by looking? Test your eye with these six side-by-side diamond images and see how well you do.

Could you tell that the center diamond in the top row and the left diamond in the bottom row are natural diamonds? The other four diamonds are lab grown. Most people find it nearly impossible to distinguish between lab grown and natural diamonds with just their eyes. This similarity is part of what makes both options so appealing.

Benefits of Lab Grown Diamonds

Lab grown diamonds are a compelling option for those looking to purchase fine jewelry — these benefits explain why.

  1. Support for Sustainable Practices: Lab diamonds are a responsible choice as they are grown with precise technology that doesn't involve mining. Their production typically has a smaller carbon footprint and less environmental disruption, making them a responsible choice for conscious consumers. 
  2. Identical to Natural Diamonds: Lab diamonds are chemically, physically, and optically identical to mined diamonds. 
  3. Available in Various Colors: Lab diamonds are easily created in unique and vibrant hues like pink, yellow, and blue. These stunning color options are more affordable than their natural counterparts, giving buyers more creative freedom to select a diamond that matches their personal style. 
  4. Value: Lab diamonds are generally more affordable than mined diamonds of the same size and quality. This means you can invest in a larger or higher-quality diamond at the same budget, making it an attractive choice for those seeking luxury at a more accessible price point.

Lab Grown Diamond Certification

Both lab grown and natural diamonds undergo the same grading and certification process from reputable gemological labs, such as the Gemological Institute of America (GIA) and the International Gemological Institute (IGI). The certification process for lab grown diamonds grades quality while ensuring authenticity. A certified lab diamond has undergone an evaluation by a recognized gemological laboratory like IGI or GIA. These gemological laboratories use specialized equipment to grade the diamond’s quality and verify authenticity, while detailing its cut, color, clarity, carat weight, and other unique characteristics or treatments so buyers have accurate information about their diamond.  

Which Are Better: Lab Grown or Natural Diamonds?

Neither lab grown nor natural diamond is inherently better. The choice between lab grown and natural diamonds ultimately depends on your personal values and priorities: 

  • Our Klara Allen gemologists recommend choosing lab grown diamonds if: You prioritize affordability and want a larger stone for your budget. and you are concious to environment.

Lab Grown Diamond FAQ

The only real difference between lab and natural diamonds is their origin: lab diamonds are grown in laboratory settings, while natural diamonds form deep within the Earth. Otherwise, lab diamonds are identical to natural diamonds and 100% real.

Yes, lab grown diamonds are cheaper than natural diamonds. Lab diamonds cost less than natural diamonds because they can be produced on demand, while natural diamonds are a limited resource.

Comparing the ethics of lab grown and natural diamonds involves weighing their distinct impacts:

  • Environmental Impact: Lab diamonds avoid mining, reducing land use. 
  • Supply Chain Transparency: Lab diamonds are generally easier to trace to the source. However, blockchain tracking technology and certifications like the Kimberley Process exist to support conflict-free natural diamonds.  
  • Labor Practices: Lab diamonds are produced in controlled settings with lower risk working environments.

Yes, lab grown diamonds are as hard as natural diamonds, with a rating of 10 on the Mohs hardness scale. This hardness makes both lab and natural diamonds highly resistant to scratching and ideal for long-lasting jewelry.

Yes, lab grown diamonds will test as real diamonds because they have the same chemical composition as natural diamonds.

Yes, lab diamonds are as good as real diamonds. Lab grown diamonds match natural diamonds in brilliance, durability, and quality, making them an excellent choice for those looking for a genuine diamond at a more affordable price.

Yes, lab diamonds are chemically, optically, and physically the same as natural diamonds. The only difference is their origin.

Most jewelers cannot tell the difference between lab created and natural diamonds without specialized tools. Gemologists use advanced equipment, like UV light and high-magnification microscopes, to detect growth characteristics unique to lab diamonds.