Where they came from, how they’re made, and why so many people are choosing them
Lab grown diamonds have had quite the journey. Not long ago, they barely existed outside a research laboratory. Now they sit in engagement rings, anniversary gifts, and pieces people wear every single day, and the conversations we have with customers about them have changed enormously over the past few years.
But there’s still a lot of confusion about what they actually are, where they came from, and what it all means for you as a buyer. So let’s start from the beginning.
It Started in the 1950s…
Most people assume lab grown diamonds are a recent invention. They’re not. The first verified diamond grown in a laboratory was created by General Electric in the United States in 1954. Scientists had worked out that diamonds are simply carbon atoms locked into a crystal structure, and if you could recreate the conditions under which that happens naturally, you could, in theory, grow one yourself.
The result of that 1954 breakthrough was impressive as a scientific achievement, but the diamond itself was tiny, cloudy, and nowhere near gem quality. For the next several decades, lab grown diamonds stayed firmly in the industrial world. They were used in drill bits, cutting tools, and precision manufacturing. Anywhere you needed something incredibly hard, but nobody was going to admire it.
The idea of a beautiful, wearable lab grown diamond remained out of reach for a long time. Progress happened slowly, quietly, and mostly out of public view. But it was happening.
So How Do You ‘Grow’ a Diamond?
There are two methods, and both are fascinating in quite different ways.
High Pressure High Temperature (HPHT)
This is the original method, and it does exactly what the name suggests. A tiny diamond seed is placed in a chamber alongside carbon, then subjected to temperatures above 1,400 degrees Celsius and pressure of around 1.5 million pounds per square inch. In other words, it recreates the conditions deep inside the earth. The carbon melts and crystallises around the seed. A diamond grows.
The machines that do this are large, energy-intensive, and expensive to run. The process can take weeks. HPHT stones are real and can be beautiful, though they sometimes carry a faint yellow or brown tint depending on the conditions during growth.
Chemical Vapour Deposition (CVD)
CVD is the method that changed everything for the jewellery market. Rather than brute force, it uses chemistry. A diamond seed is placed in a sealed chamber filled with a carbon-rich gas, usually methane. The gas is ionised using microwaves or lasers, which breaks the molecules apart and allows individual carbon atoms to settle onto the seed, layer by layer, atom by atom. A diamond builds itself, slowly and precisely.
CVD operates at lower pressures, gives scientists much greater control over the process, and has made it possible to grow larger, cleaner, more consistent stones than HPHT ever could. The vast majority of lab grown diamonds you will see in fine jewellery today are CVD-grown.
Either way, what comes out of the chamber is a real diamond. Same chemistry, same crystal structure, same hardness. The process is different; the stone is not.
The Moment It All Changed
For most of the late twentieth century, lab grown diamonds were simply not a consumer product. The quality wasn’t there, the costs were high, and the wider jewellery industry had little interest in exploring the possibility.
Things began to shift in the early 2000s, when the first gem-quality stones came to market. They were rare, expensive, and largely unknown outside specialist circles. But the technology kept improving. Through the 2010s, CVD grew better and faster, producing cleaner stones at scale. Prices started to move.
The real turning point came when the major independent grading laboratories took notice. The Gemological Institute of America began issuing grading reports for lab grown diamonds in 2007, and the International Gemological Institute followed. Suddenly a lab grown diamond could carry the same paperwork as a mined one, assessed by the same experts against the same standards. That gave buyers something they hadn’t had before: confidence.
Why They’ve Become So Popular So Quickly
In 2015, lab grown diamonds were a curiosity. By the early 2020s, they had become a genuine part of the fine jewellery conversation. The growth has been striking, and it hasn’t happened by accident.
As production scaled up and more manufacturers entered the market, prices fell significantly. A lab grown diamond that might have cost close to the equivalent of a mined stone in 2015 could be sixty to eighty percent less by 2023 for the same carat weight and quality. That kind of shift in accessibility changes who is able to buy a diamond, and what they can afford to choose.
At the same time, buyers started asking different questions. A new generation came into the jewellery market wanting to understand where things came from and what the implications of their purchase might be. Lab grown diamonds offered a clear and honest answer on both counts: known origin, fully traceable, and a smaller environmental footprint per carat than mining in most assessments.
And for many people, it was simply the appeal of what the stone could be. The same certified, sparkling, independently graded diamond, at a price that allowed them to go bigger or better than they thought possible.
What ‘Identical’ Actually Means
This is the part that surprises people most. A lab grown diamond and a mined diamond are not similar. They are, in every scientific sense, the same thing. Same chemical composition. Same crystal structure. Same hardness (Mohs 10, the highest possible). Same refractive index, the quality that gives diamonds their distinctive brilliance and fire.
You cannot tell them apart by looking at them. Not with the naked eye, and not with a standard jeweller’s loupe. Even advanced gemological equipment has to work hard to identify a lab grown stone, using spectroscopy to detect subtle differences in how the carbon atoms were arranged during growth. These distinctions exist at an atomic level. They have no bearing on how the diamond looks, feels, or wears.
What is different is the story. A mined diamond formed over hundreds of millions to billions of years, deep in the earth, and was carried to the surface by volcanic activity. A lab grown diamond was created in a controlled environment in a matter of weeks. Both of those stories are remarkable in their own way. Which one resonates with you is a deeply personal question.
One thing worth being clear about: because lab grown diamond production continues to scale and prices have moved considerably in recent years, lab grown stones do not hold resale value in the way natural diamonds have traditionally done. If that matters to you, it’s worth factoring in. If it doesn’t, there is no meaningful compromise on the beauty or quality of the stone itself.
The 4 Cs: Exactly the Same Conversation
When you come in to talk about a lab grown diamond, we have exactly the same conversation about quality as we would for a natural stone. The 4 Cs apply in full.
Cut is the most important of the four, and it’s entirely down to the skill of the cutter rather than how the diamond was grown. Cut determines how light travels through the stone and how much brilliance and fire you see. A beautifully cut lab grown diamond will outshine a poorly cut natural stone every time.
Colour is graded on a scale from D (completely colourless) down to Z. Lab grown diamonds, particularly CVD stones, can and do achieve the very top colour grades. The controlled growing environment actually makes high colour grades more consistent.
Clarity refers to the presence of inclusions or surface marks. Lab grown diamonds can have inclusions just as natural diamonds do, though the type of inclusion differs because of how the stone was formed. A good clarity grade means a clean, beautiful stone regardless of origin.
Carat is simply the weight of the stone. One carat equals 0.2 grams, and this works identically whether a diamond was grown in a laboratory or pulled from the ground.
Any lab grown diamond we sell comes with an independent grading report from GIA or IGI, using exactly these criteria. The report will clearly state that the stone is laboratory-grown, but the standard of assessment is identical to that of a natural diamond.
Who Is Choosing Them, and Why?
In our experience, there is no single type of lab grown diamond buyer. The conversations we have are as varied as the people having them.
Some customers come in with a clear budget and want to make the most of it. A lab grown diamond means they can choose a stone that would simply have been out of reach otherwise. For an engagement ring in particular, that can feel like a significant and genuinely exciting difference.
Others are drawn by the transparency. Knowing exactly where a stone came from, with no ambiguity, matters to a lot of people. It’s a straightforward, honest answer to a question that isn’t always easy to answer with a mined diamond.
And some people simply like the idea of a stone that was created rather than extracted. Something built through science and precision feels like a fitting way to mark a moment in a modern life.
None of these reasons is better or more valid than another. What matters is that you know your options and make a choice that feels right for you. That’s the conversation we love to have.
It is worth understanding one important difference between lab grown and natural diamonds when it comes to value. Natural diamonds have a well-established resale market, and significant stones have historically held their worth over time. Lab grown diamonds are a different matter. As production has scaled and continues to do so, prices have fallen considerably in recent years and are likely to continue in that direction. A lab grown diamond is best thought of as a purchase for the piece itself rather than something that will hold or grow in value over time.
Thinking About a Lab Grown Diamond?
If you’d like to see them alongside natural diamonds, ask questions, or simply get a feel for what’s out there, come and talk to us. No pressure, no sales pitch. Just an honest conversation with people who know their stones.
We’ve also put together a detailed comparison of lab grown and natural diamonds if you’d like to weigh both options side by side before you decide. You can read it here: Lab Grown vs Natural Diamonds: Understanding Your Options
Pop in and see us at 23 High Street in Weston-super-Mare, or give us a call on 01934 628 361. We’re always happy to help.



