How Are Lab-Grown Diamonds Made? From Lab to Luxury

How Are Lab-Grown Diamonds Made? From Lab to Luxury

| Reading time: 7 minutes

The diamond industry is experiencing a dazzling transformation with the rise of lab-grown diamonds. These stunning gems are not only a marvel of modern science but also a sustainable and ethical alternative to mined diamonds. 

Have you ever wondered how lab-grown diamonds are made? This guide will take you through the fascinating process, revealing the technology and artistry behind these exquisite creations. Discover the secrets of lab-grown diamonds and why they are captivating jewelry enthusiasts worldwide.

How Are Lab-Grown Diamonds Made?

Understanding how lab diamonds are made involves delving into sophisticated scientific processes that mimic the natural conditions under which diamonds form. 

So, how do they make lab grown diamonds? The lab grown diamond process primarily involves two methods: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD).

What’s The Difference Between the Methods?

When exploring how lab-grown diamonds are made, it's crucial to understand the two primary methods: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD). Each method has unique processes, advantages, and applications, shaping the quality and characteristics of the diamonds produced.

CVD Lab Grown Diamond Process

The CVD lab-grown diamond process begins with a thin slice of natural diamond, called a diamond seed, placed in a vacuum chamber. A carbon-rich gas, like methane, is introduced, and the chamber is heated to extreme temperatures (800-1200°C). This heat causes carbon atoms in the gas to deposit onto the seed layer by layer, forming a new diamond over several weeks. 

This method produces high-purity diamonds, free from many natural impurities, and allows precise control over the diamond's growth. The CVD lab-grown diamond process is efficient and scalable, making it a popular choice for creating high-quality lab-grown diamonds for both industrial and jewelry purposes.

Understanding “how lab-grown diamonds are made” using the CVD process highlights the blend of advanced technology and craftsmanship in producing these stunning, ethical, and sustainable gems.

HPHT Lab Grown Diamond Process

The HPHT lab-grown diamond process (High Pressure, High Temperature) replicates the natural conditions of diamond formation deep within the Earth. Here's a concise look at this fascinating method: 

  1. Diamond Seed: The procedure begins by placing a small diamond seed inside a growth chamber.
  2. Extreme Conditions: The seed undergoes temperatures of about 1,500 degrees Celsius and pressures of around 1.5 million pounds per square inch. These conditions cause the carbon source (usually graphite) to dissolve and crystallize around the seed.
  3. Growth: Carbon atoms bond with the seed, forming a diamond layer by layer over several weeks.
  4. Harvesting: Once the desired size is achieved, the diamond is extracted, cut, and polished.

The process results in high-quality diamonds that are almost identical to natural ones, making them ideal for both jewelry and industrial applications. This method exemplifies the innovation in creating sustainable and ethically sourced diamonds.

CVD vs. HPHT diamonds

The main differences between HPHT and CVD methods are in their growth environments and the resulting diamond characteristics. HPHT diamonds often look more natural but may have metallic inclusions. CVD diamonds are generally more uniform but can show unique striations from their layered growth.

Knowing these distinctions helps you choose the right type of lab-grown diamond for your needs, whether for jewelry or industrial use. Understanding how lab-grown diamonds are made through HPHT and CVD methods guides you in making an informed choice.

How Are Lab-Grown Diamonds Made? From Lab to Luxury

Where Are Lab Diamonds Made?

Lab diamonds are created in high-tech facilities equipped with advanced technology to mimic the natural diamond formation process. These facilities are strategically situated in areas with robust scientific and technological infrastructure.

United States

The U.S. hosts several leading companies and research institutions that specialize in creating lab-grown diamonds. Cities like Boston, San Francisco, and New York are home to pioneering firms such as Diamond Foundry and Brilliant Earth, which utilize cutting-edge technologies to produce high-quality diamonds.


China is a major player in the lab-grown diamond industry, with numerous factories dedicated to the production of synthetic diamonds. The country’s advanced manufacturing capabilities and investment in research and development make it a significant hub for lab-grown diamond production.


India, traditionally known for its diamond cutting and polishing industry, has also embraced the production of lab grown diamonds. Cities like Surat are evolving as key centers for both natural and lab grown diamond manufacturing, leveraging their skilled workforce and existing infrastructure.


European countries, including Germany and the Netherlands, are also contributing to the lab-grown diamond market. These countries focus on both research and commercial production, driving innovation and quality in the industry.


Singapore is emerging as a notable location for lab grown diamond production, with companies like IIa Technologies leading the way. The country's dedication to technological innovation and rigorous quality control guarantees the creation of high-quality lab-grown diamonds.

Understanding how lab-grown diamonds are made involves recognizing the global nature of their production. These diamonds are manufactured in specialized facilities across various countries, each contributing to the advancement and accessibility of these sustainable gems.

What is a Lab Grown Diamond Made of?

Lab-grown diamonds, often referred to as synthetic or cultured diamonds, are composed of the same material as natural diamonds: carbon. The exceptional hardness and sparkle of diamonds arise from the distinct pattern of carbon atoms within their crystal structure. Despite being created in a laboratory, lab-grown diamonds share identical physical, chemical, and optical properties as their natural counterparts.

Understanding how lab-grown diamonds are made highlights that these gems are far from "fake." They consist of real carbon, structured in the same crystalline form as mined diamonds. This similarity ensures that lab-grown diamonds exhibit the same stunning sparkle and durability, making them a popular choice for ethical and sustainable jewelry.

What is a Lab Grown Diamond Made of?

Can You Distinguish a Natural Diamond from a Lab-Grown Diamond?

Distinguishing a natural diamond from a lab-grown diamond can be challenging without professional tools. Both have identical chemical and physical properties., making them visually identical to the naked eye. However, experts can detect subtle differences.

Natural diamonds originate deep within the Earth through a process that spans millions of years, whereas lab-grown diamonds are produced using techniques such as High-Pressure High Temperature (HPHT) or Chemical Vapor Deposition (CVD). These processes can leave unique growth patterns and inclusions. HPHT diamonds might have metallic inclusions, whereas CVD diamonds can show specific growth striations.

Gemologists use advanced tools like spectroscopy to identify these differences. Although both types of diamonds will test as real under traditional testers, understanding how lab-grown diamonds are made helps highlight their unique features.

How do Natural Diamonds Form?

Natural diamonds originate approximately 100 miles beneath the Earth's surface, deep within the mantle. Here, carbon atoms are subjected to extreme temperatures over 2,000 degrees Fahrenheit and immense pressures exceeding 725,000 pounds per square inch. Under these circumstances, carbon atoms form the distinct structure responsible for diamonds' hardness and brilliance.

This process takes between one and three billion years. Volcanic eruptions then bring these diamond-bearing rocks closer to the Earth's surface, creating kimberlite pipes through which diamonds can be mined.


Lab-grown diamonds represent a blend of science, technology, and artistry, offering a stunning and ethical alternative to mined diamonds. Created through methods like high pressure high temperature (HPHT) and chemical vapor deposition (CVD), these diamonds are real, and they share the same physical and chemical properties as natural ones.

They pass all standard tests for authenticity and receive certification from top gemological institutes. Lab-grown diamonds are not just sustainable but also more affordable, making them a popular choice for many. As more people look for eco-friendly and ethical options, lab-grown diamonds are set to become even more significant in the jewelry world. Whether you're buying or just curious, understanding how lab-grown diamonds are made highlights the incredible innovation behind these gems.


Are lab-grown diamonds fake?

No, lab-grown diamonds are not fake. They share the same chemical composition and physical properties as natural diamonds. The primary distinction lies in their origin: lab-grown diamonds are produced in controlled settings using advanced technology, while natural diamonds form over billions of years on the Earth.

Certified by organizations like the GIA and IGI, lab grown diamonds are graded on the same 4 Cs (Cut, Color, Clarity, Carat) as natural diamonds. Created through methods like HPHT and CVD, these diamonds are real, sustainable, and ethical alternatives to mined diamonds, offering the same beauty and value.

Do lab-grown diamonds test as real diamonds?

Yes, lab-grown diamonds are tested as real diamonds. They have the same chemical and physical characteristics as natural diamonds, which means they pass standard diamond tests. 

Testing Methods

Thermal Conductivity: Lab-grown diamonds conduct heat like natural diamonds, so thermal testers confirm their authenticity.

Electrical Conductivity: Advanced testers that measure electrical conductivity also recognize lab-grown diamonds as real.

Gemological Analysis: Professional labs like GIA and IGI use specialized equipment to certify lab-grown diamonds as genuine.

Lab-grown diamonds are identical to natural diamonds in standard tests, offering consumers a genuine alternative when looking for real diamonds.

Are Lab-Grown Diamonds Eco-Friendly?

Yes, lab-grown diamonds are more eco-friendly than mined diamonds. They eliminate destructive mining, use less energy, and require minimal water. Additionally, they are conflict-free, avoiding ethical issues associated with mined diamonds.

Can Diamonds Be Made Artificially in Any Other Way?

While HPHT and CVD are the primary methods for creating lab-grown diamonds, ongoing research explores other techniques and improvements to make the process more efficient and scalable.​