The 6 Key Differences Between Lab-Grown Diamonds & Natural Diamonds

Lab-grown diamonds and natural diamonds often look identical at first glance, and in many ways, they are. Both have the same chemical composition, the same hardness, and the same brilliance when properly cut. To the naked eye, there is no visible difference between the two.

The key distinctions lie not in how they look, but in how they are formed and how they enter the market. Natural diamonds develop deep within the Earth over billions of years, while lab-grown diamonds are created using advanced technology that replicates the conditions in which diamonds form naturally.

For many buyers, especially those choosing an engagement ring, understanding this comparison can make all the difference in a decision. In this guide, we’ll outline six key differences between lab-grown and natural diamonds, from how they are created to how they are valued, helping you better understand both options.

The most fundamental difference between lab-grown and natural diamonds lies in how they are created.

Natural diamonds form deep within the Earth’s mantle under extreme heat and pressure. This process occurs roughly 150–200 kilometres beneath the Earth’s surface and can take between one and three billion years before the diamonds are brought closer to the surface through volcanic activity.

Lab-grown diamonds, however, are produced in controlled laboratory environments using advanced technology designed to replicate natural conditions. Two main methods are used: High Pressure High Temperature (HPHT) and Chemical Vapour Deposition (CVD). Both processes allow scientists to grow diamonds in a matter of weeks rather than billions of years.

Despite their different origins, both lab-grown and natural diamonds share the same crystal structure, chemical composition and physical properties. This means they are equally real diamonds, with the primary distinction being the environment they’ve been created in.

One of the most noticeable differences between lab-grown and natural diamonds is price.

Lab-grown diamonds typically cost 20–40% less than natural diamonds of comparable size and quality. This is largely due to the way they are produced. Because they can be created in controlled environments, supply is more consistent, and production is less dependent on geological rarity.

Natural diamonds, on the other hand, are rarer and require extensive mining, cutting and distribution processes. These factors contribute to their higher price point, as well as their long-established position within the jewellery market.

While both options offer the same visual appearance and physical properties, the price difference often allows you to choose a larger or higher quality diamond within the same budget when opting for a lab-grown stone.

Both lab-grown and natural diamonds are graded using the same standards, but their reports clearly identify their origin.

Independent gemological laboratories such as the Gemological Institute of America (GIA) and the International Gemological Institute (IGI) assess both types of diamonds using the 4Cs: cut, colour, clarity and carat weight. This means they are evaluated in the same way for quality and performance.

The key difference is that grading reports will always state whether a diamond is natural or laboratory-grown. This ensures transparency, allowing buyers to understand exactly what they are purchasing.

Resale value is another area where lab-grown and natural diamonds can differ.

Natural diamonds have historically held a more established position in the resale market. Their long-standing demand and perceived rarity mean they are more commonly resold, although resale prices can still vary depending on factors such as quality, certification and market conditions.

Lab-grown diamonds are a more recent development, and their resale market is still evolving. As production has increased and prices have adjusted over time, resale values for lab-grown diamonds tend to be less predictable.

It’s important to note that diamonds are typically purchased for their significance rather than as financial investments. However, understanding how each type is positioned in the market can help provide a clearer overall comparison.

Rarity is another key distinction between lab-grown and natural diamonds.

Natural diamonds are limited by geology. They form under specific conditions and are only found in certain locations, making their supply inherently finite. This natural scarcity has long contributed to their value and desirability within the jewellery market.

Lab-grown diamonds, however, are not restricted by natural availability. They can be produced using controlled processes, meaning supply is more consistent and scalable.

This difference doesn’t affect how the diamonds look or perform, but it does influence how they are positioned in the market, with natural diamonds often associated with rarity, and lab-grown diamonds offering greater accessibility.

While there are clear differences between lab-grown and natural diamonds, it’s equally important to understand what they have in common. In many practical ways, they are far more alike than they are different.

Real diamonds with the same chemical composition (pure carbon)

• Equally hard, ranking 10 on the Mohs scale

• Graded using the same 4Cs: cut, colour, clarity and carat

• Capable of the same brilliance and sparkle when well cut

• Certified by recognised gemological laboratories

This means that visually and structurally, there is no difference in how they perform or appear once set in jewellery. The distinction lies in their origin and how they are brought to market, not in their fundamental properties.

For buyers, this shared foundation makes it easier to compare options directly, focusing on what matters most to them, whether that’s budget, background or personal preference.

Understanding the differences between lab-grown and natural diamonds is an important step, but the right choice ultimately comes down to what feels most meaningful to you.

At Diamonds & Co, we offer both lab-grown and natural diamond jewellery collections, each selected for quality, balance and craftsmanship. Whether you’re drawn to the history of natural diamonds or the innovation behind lab-grown stones, both are crafted to the same high standard and designed to be worn for years to come.

For more information on either, our Lab-Grown Diamond Guide and Diamond Buying Guide can give you more detail in comparing your options with confidence.