CVD vs HPHT Lab-Grown Diamonds: Know the Difference between these Two.

CVD vs HPHT Lab-Grown Diamonds: Know the Difference between these Two.

CVD vs HPHT Lab-Grown Diamonds: Know the Difference between these Two.

In recent years, lab-grown diamonds have gained immense popularity, offering an ethical and affordable alternative to natural diamonds. Among the methods used to create these stunning gems, CVD (Chemical Vapor Deposition) and HPHT (High-Pressure High-Temperature) are the most prominent. But what sets these two processes apart? At Michael Arthur, Australia’s premier destination for exquisite diamond jewellery, we are committed to helping you make an informed choice. In this blog, we’ll delve into the world of lab-grown diamonds, comparing CVD and HPHT diamonds to help you find the perfect gem for your needs.

Are lab-created diamonds considered genuine diamonds?

Absolutely! Sometimes, a lab-grown diamond may be referred to as a 'synthetic diamond'. Nevertheless, this terminology may be deceptive since lab-created diamonds have the same chemical and physical composition as naturally mined diamonds, and therefore should only be differentiated by their method of creation.

This is particularly accurate when compared to other crystals like cubic zirconia or moissanite, which are popular alternatives to diamonds. These crystals possess a chemical composition that is entirely distinct from that of artificially produced diamonds and should be viewed solely as a replacement for diamonds.

Comparison between lab-created diamonds and naturally occurring diamonds from the earth.
A lab-grown diamond is identical to a natural diamond in terms of its optical, physical, and chemical properties. Lab-created diamonds, whether produced using the HPHT or CVD process, offer certain important benefits over naturally mined diamonds. Due to the expensive nature of mining and the limited availability of natural diamonds, synthetic diamonds are nearly 40% more affordable than their earth-grown counterparts. Lab-created diamonds also originate dly, particularly when cultivated using renewable energy sources.

CVD vs HPHT Lab-Grown Diamonds by Michael Arthur

Understanding CVD Diamonds

CVD diamonds are renowned for their high quality and purity. They typically exhibit fewer inclusions compared to natural diamonds, resulting in a clearer and more brilliant stone. CVD diamonds can be produced in various shapes and sizes, making them versatile for different types of jewellery.

 Understanding HPHT Diamonds

HPHT diamonds are known for their excellent structural integrity and brilliance. They can be produced with fewer nitrogen impurities, which often results in better colour grades. HPHT diamonds can also exhibit a more "natural" look, with some inclusions similar to those found in mined diamonds.


Difference Between Rough CVD and HPHT Diamonds 

Comparing CVD vs HPHT Lab-Grown Diamonds

Pros of CVD and HPHT Diamonds

CVD Diamonds

  • High Purity: CVD diamonds often have fewer inclusions, leading to                                    superior clarity.
  • Customization: The process allows for precise control over the diamond's                              size and shape.
  • Sustainability: CVD diamonds are environmentally friendly, requiring less                              energy and resources compared to mining.


HPHT Diamonds:

  • Color Quality: HPHT diamonds often have excellent colour grades,                                       sometimes achieving D (colourless) ratings.

  •  Growth Speed: The process can be faster, producing diamonds more                                     quickly than CVD.

  •   Cost Efficiency: HPHT diamonds can sometimes be produced at a                                           lower cost due to the faster production time.


Comparing CVD Diamonds and HPHT Diamonds

Differences in the Manufacturing Process

While both CVD and HPHT methods aim to create high-quality diamonds, they do so through different techniques. The CVD process focuses on building the diamond layer by layer in a gas-filled chamber, whereas the HPHT process uses intense pressure and heat to mimic natural diamond formation. These fundamental differences result in unique characteristics and potential applications for the diamonds produced. Each has its beauty and charm.

 Differences in Quality and Characteristics

Clarity and Inclusions:CVD Diamonds: Generally, exhibit fewer inclusions, leading to higher clarity grades. HPHT Diamonds: May have more metallic inclusions but can achieve high clarity with proper refinement. 
Colour:CVD Diamonds: May require post-growth treatments to enhance color. HPHT Diamonds: Often have better initial colour grades, sometimes reaching colourless status.

 Structural Integrity:

CVD Diamonds: Have a uniform structure due to the layer-by-layer growth process. HPHT Diamonds: Exhibit a natural structure with some internal stress, similar to mined diamonds.

 In the end, what sets an HPHT diamond apart from a CVD diamond is the varying patterns of diamond growth. An expert in lab diamonds could distinguish between an HPHT and a CVD diamond by examining the crystal structure under magnification.

HPHT diamonds have a cuboctahedron form with 14 growth directions, whereas CVD diamonds have a cubic shape with just one growth direction. Sometimes, a CVD diamond may exhibit signs of strains, although this occurrence is uncommon and can only be observed at very high levels of magnification.
You can be confident that our skilled team inspects each diamond twice in our workshop to ensure it meets our high-quality standards.

The HPHT (High Pressure High Temperature) Lab Diamond Growing Method

HPHT diamonds boast the same physical and chemical properties as mined diamonds, making them indistinguishable to the naked eye and equally dazzling. The HPHT method offers a more sustainable alternative to traditional mining, with less environmental impact. It also allows for greater control over diamond color and clarity, making it ideal for creating flawless gems.

However, HPHT diamonds can sometimes have a faint yellow hue due to nitrogen impurities and may contain metallic inclusions. These features, though rare, can help identify them as lab-grown. So, the next time you admire a sparkling diamond, it might just be a testament to human ingenuity and the power of replicating nature's wonders.

Are HPHT Diamonds Real?

They're just like mined diamonds – same sparkle, same toughness. The only difference is how they're born. HPHT stands for High Pressure, Hot Temperature. Imagine a super-strong oven that squeezes really hard. That's how scientists create HPHT diamonds, like speeding up what happens deep underground. So, HPHT diamonds are real diamonds, but made in a special way, often for less money too!

The CVD (Chemical Vapor Deposition) Lab Diamond Growing Method

Imagine growing diamonds not underground for millions of years, but in a high-tech lab! The CVD (Chemical Vapor Deposition) method is like a recipe for diamonds.CVD diamonds are known for their exceptional clarity and purity. Unlike some HPHT diamonds, they can even be grown in fancy colors like pink or blue! This method is also eco-friendly, using less energy than traditional mining. So, the next time you see a sparkling diamond, it might be a product of the CVD method, where science allows us to create stunning gems in a controlled way.

The CVD (Chemical Vapor Deposition) Lab Diamond Growing Method

Applications in Jewelry

Both CVD diamonds and HPHT diamonds are suitable for all types of jewellery, from engagement rings to earrings and necklaces. However, their unique properties might make one type more appealing depending on your specific needs. You can create your own masterpiece with Michael Arthur experts.

 Importance of Certification and Ethical Considerations

When purchasing any diamond, certification is crucial. It ensures that reputable organizations have independently verified the diamond’s quality, authenticity, and characteristics. At Michael Arthur being your trusted jewellery stop always check up and cover these things, so you don’t have to worry about anything other than just picking your favourite diamond.

 Informed Decision-Making

At Michael Arthur, we are dedicated to helping you make an informed and confident choice. By considering factors such as clarity, colour, budget, and ethical impact, you can select the perfect lab-grown diamond that aligns with your values and desires. Our extensive collection of both CVD and HPHT diamonds ensures that you will find the ideal gem for your jewellery piece.

Explore the brilliance and beauty of lab-grown diamonds with Michael Arthur, where innovation meets elegance. Make an informed decision today and embrace the future of diamond jewellery.


 "Embrace brilliance with lab-grown diamonds – where innovation meets ethical elegance."