Lab-grown diamonds, or synthetic diamonds, are created in laboratories using advanced technology that replicates the natural diamond formation process. They are chemically and physically identical to mined diamonds, offering the same brilliance, hardness, and durability. However, they typically come at a lower cost and are considered more ethical and environmentally friendly.
This guide covers how lab-grown diamonds are made, how they compare to natural diamonds, their grading process, and key factors to consider when choosing between the two.
What Is a Lab-Grown Diamond?
A lab-grown diamond is a real diamond produced in a controlled laboratory environment using advanced technology. It is chemically, physically, and optically identical to a natural diamond but forms within weeks instead of over billions of years deep inside the Earth.
Lab-grown diamonds are created using two main methods: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD). HPHT replicates the extreme heat and pressure of the Earth’s mantle to form diamonds from carbon. CVD involves a gas-rich chamber where carbon atoms accumulate on a diamond seed, forming the crystal layer by layer.
Once formed, these diamonds are graded and certified by recognised institutions such as the Gemological Institute of America (GIA). Like natural diamonds, they are evaluated using the 4Cs: cut, colour, clarity, and carat. This process ensures transparency and quality for consumers.
Are Lab-Grown Diamonds Real Diamonds?
Yes, lab-grown diamonds are 100% real diamonds.
They are considered real because they share the exact same chemical composition as natural diamonds — pure carbon arranged in a crystallised lattice. This structure gives diamonds their well-known hardness and brilliance, and lab-grown diamonds exhibit both qualities to the same degree as their mined counterparts. On a Mohs scale of hardness, they score a 10, just like natural diamonds, making them equally durable and suitable for everyday wear.
In appearance and performance, there is no visual or structural difference without specialised equipment. Both types reflect light in the same way, offering the same fire and sparkle. The key distinction lies in origin and price. Lab-grown diamonds are created in high-tech laboratories rather than formed underground over billions of years. This controlled production process typically results in more affordable pricing, often 30 to 40 percent less than natural diamonds of similar quality.
Lab-grown diamonds offer a genuine alternative for those seeking beauty, durability, and value without compromising on authenticity.
How Are Lab-Grown Diamonds Made?
Lab-grown diamonds are created using two advanced techniques: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD). These methods replicate the natural conditions in which diamonds form, enabling carbon atoms to crystallise into a diamond structure. The controlled environment allows diamonds to grow within weeks and provides a reliable, sustainable alternative to mined stones.
High Pressure High Temperature (HPHT)
The High Pressure High Temperature (HPHT) method replicates the natural conditions under which diamonds form deep within the Earth. In this process, a small diamond seed is placed into a carbon source and exposed to extreme pressure of about 5 GPa and temperatures of up to 1,400 degrees Celsius.
These conditions cause the carbon to melt and gradually form around the seed, eventually crystallising into a larger diamond. After cooling, the crystal is extracted and cleaned. HPHT is one of the earliest and most reliable methods for producing gem-quality lab-grown diamonds and is especially effective for creating stones with high clarity.
Chemical Vapor Deposition (CVD)
The Chemical Vapour Deposition (CVD) method produces diamonds by placing a thin slice of diamond seed inside a vacuum chamber filled with carbon-rich gases, typically methane and hydrogen. The chamber is then heated to temperatures between 800 and 1,000 degrees Celsius.
At high temperatures, the gases break down, and carbon atoms begin to separate and deposit onto the diamond seed layer by layer. Over time, these carbon layers crystallise into a larger diamond with the same structure as a natural one. CVD provides greater control over diamond quality and is commonly used to produce stones with high clarity and minimal inclusions.
Lab-Grown vs Natural Diamonds: What’s the Difference?
Lab-grown and natural diamonds may appear identical, but they differ in origin, environmental impact, and how they are perceived in the market. The table below outlines a clear comparison between the two:
| Feature | Lab-Grown Diamond | Natural Diamond |
| Origin | Created in a laboratory using HPHT or CVD methods | Formed naturally underground over billions of years |
| Physical / Optical | Same structure, hardness, and brilliance | Same structure, hardness, and brilliance |
| Environmental Impact | Lower impact due to controlled production | Higher impact due to mining and land disruption |
| Price | Typically 30 to 40 per cent more affordable | Higher cost due to rarity and mining expenses |
| Value & Perception | Considered ethical and modern by many buyers | Seen as rare and traditional with generally higher resale value |
Can You Tell the Difference Between Lab and Natural Diamonds?
No, you cannot distinguish between lab-grown and natural diamonds with the naked eye. Both have the same chemical composition, hardness, and brilliance. Only specialised equipment used by gemmologists can detect the growth patterns or trace elements that indicate their origin.
How Are Natural Diamonds Formed in Nature?
Natural diamonds form deep within the Earth’s mantle, around 150 to 200 kilometres below the surface. Under extreme heat, typically between 900 and 1,300 degrees Celsius, and immense pressure, carbon atoms crystallise into diamonds over billions of years.
These diamonds reach the surface through rare volcanic eruptions. As the magma cools, it solidifies into vertical structures called kimberlite pipes, which are the primary source of mined diamonds.
Only about one in every 200 kimberlite pipes contains gem-quality diamonds, making natural diamonds exceptionally rare.
Fun fact: Some natural diamonds are estimated to be over three billion years old, meaning they may be older than the dinosaurs. Notable diamond-rich regions include South Africa, Siberia, and parts of Western Australia.
Are Lab Diamonds Graded and Certified?
Yes, lab-grown diamonds are graded and certified in the same way as natural diamonds. Leading gemmological laboratories, such as the Gemmological Institute of America (GIA) and the International Gemmological Institute (IGI), provide certificates that assess the quality of each lab-grown stone.
Certification is based on the Four Cs:
- Cut: How well the diamond has been shaped and faceted, which affects its brilliance.
- Colour: The degree of colour present, graded from colourless to light yellow or brown.
- Clarity: The number and size of internal or surface imperfections.
- Carat: The weight of the diamond, which influences its size and value.
This grading system provides transparency and helps buyers compare lab-grown and natural diamonds with confidence.
Pros and Cons of Choosing Lab-Grown Diamonds
Pros of Choosing Lab-Grown Diamonds:
- More affordable than natural diamonds of similar size and quality
- Ethically sourced, with no mining involved
- Lower environmental impact due to reduced land and water use
- Chemically and visually identical to natural diamonds
- Offered in a broad range of styles and sizes
Cons of Choosing Lab-Grown Diamonds:
- Generally have a lower resale value than natural diamonds
- Lack the geological rarity and long historical significance of mined stones
- Some buyers may view natural diamonds as more prestigious
Should You Choose Lab-Grown or Natural Diamonds?
There is no single answer, as both lab-grown and natural diamonds have distinct qualities.
Lab-grown diamonds provide a modern, ethical, and cost-effective option. Natural diamonds are valued for their rarity and geological origin.
Whether you prefer the innovation of lab-grown stones or the tradition of natural ones, Hearts Desire offers a curated range of rings, necklaces, bracelets, and earrings to suit your style and values.
FAQ
Will lab diamonds pass a diamond tester?
Yes, Lab-grown diamonds will pass a standard diamond tester. They have the same thermal and electrical conductivity as natural diamonds, which is what most testers measure.
Do lab diamonds lose their sparkle over time?
No, Lab-grown diamonds do not lose their sparkle. Like natural diamonds, they maintain their brilliance with regular cleaning and proper care.
Are GIA certified diamonds natural or lab-grown?
GIA certifies both natural and lab-grown diamonds. Each certificate clearly states the diamond’s origin, making it easy to identify whether it is lab-created or mined.
How much is a 10 carat lab-created diamond?
The price of a 10 carat lab-created diamond varies based on cut, colour, clarity, and certification. It typically ranges from AUD $30,000 to $60,000, which is significantly lower than the cost of a natural diamond of similar size and quality.