Every diamond tells a story of immense pressure, intense heat, and time. A lot of time. But exactly how long does it take for a diamond to form? We're talking about a process that can take billions of years, making each natural diamond a tiny time capsule from deep within the Earth. It’s an incredible journey. We’ll explore how these gems are created, from their carbon origins to their final form. We'll also compare this ancient timeline to how long it takes to make a diamond today, offering a modern way to capture a personal history.
We really do not know how long it takes for a diamond to form. Scientists believe anywhere from one billion to three billion years, and that is an incredible amount of time.
How Long Does It Take for a Diamond to Form?
We have mentioned the volcanic eruptions that catapult the diamond rocks to the Earth’s Mantle. Molten lamproite and kimberlite, which is magma, are found in the upper mantle and begin to rapidly expand. The magma is then triggered to make its ascension to the surface, at a fast speed through a pipe, and a diamond joins the ride to the top.
Most diamonds are found in Kimberlite pipes, although only one in 200 kimberlite pipes will have gem-quality stones. The first time a diamond was found in a kimberlite pipe was in Kimberley, South Africa, hence where the pipes, or pathways, got their name.
The Science of Natural Diamond Formation
The journey of a natural diamond begins deep within the Earth, about 90 to 120 miles below the surface. Here, in the upper mantle, the conditions are just right for one of nature's most incredible transformations. The single, essential ingredient for a diamond is carbon. Under an immense amount of heat and pressure, carbon atoms begin to bond together in a unique crystal lattice structure, creating the hardest natural substance on Earth. This process is a testament to nature's power, turning a simple element into something truly extraordinary. It's this same fundamental science of carbon transformation that allows us to create a beautiful, lasting memorial from the carbon that makes up our loved ones.
Extreme Heat and Pressure
The terms "heat and pressure" don't quite capture the intensity of the environment needed to form a diamond. We're talking about temperatures that can soar above 2,000°F and pressure reaching over 725,000 pounds per square inch. To put that into perspective, that's the kind of pressure you'd feel if you had the entire weight of a commercial airplane balanced on the tip of your finger. It's under these incredibly harsh conditions that carbon atoms are forced to crystallize. This intense environment is precisely what gives a diamond its signature strength and brilliance, making it a symbol of endurance and unbreakable bonds.
A Journey Through Geologic Time
Patience is a virtue, and Mother Nature has it in spades. The formation of a natural diamond isn't a quick process; it's a journey that unfolds over geologic time. Scientists estimate that most of the diamonds we see today took between one billion and 3.3 billion years to form. That's a significant portion of our planet's entire history, meaning these stones are ancient relics that witnessed the world change in ways we can only imagine. Each natural diamond is a tiny time capsule, holding a story that started long before we were here, which is a beautiful thought when considering something meant to last forever.
How Old Are Natural Diamonds, Really?
So, just how old are these natural gems? The vast majority are ancient, having formed between one and three billion years ago. For all that time, they remained hidden deep within the Earth's mantle. They only made their way to the surface during rare, powerful volcanic eruptions that shot magma—and the diamonds within it—up through kimberlite pipes. It's an explosive and rare journey to the surface. At Eterneva, we honor this incredible natural process by recreating the same conditions of high heat and pressure in our lab. This allows us to grow a one-of-a-kind diamond from the carbon in ashes or hair in a matter of months, not billions of years, creating a personal and timeless connection to the one you love.
The Role of Carbon in a Diamond's Creation
We know carbon is required for a diamond to become a diamond! In fact, every carbon atom will attach to four other carbon atoms, and as this process continues, it is what makes the diamonds so strong.
For a diamond to form, there must be enough carbon nearby to bond with each other to form a rough diamond. Simply put, the carbon is magnetized to one another, over and over again until the diamond has formed.
Tracing Carbon's Journey to a Diamond
Scientists have educated guesses, yet there is no way to truly know what is happening deep in the Earth’s Mantle during this billion-year process. There is carbon that is already in the Earth. We also know that when two tectonic plates collide, carbon from plants, animals, rocks, and the like, falls down to the upper mantle and will contribute to the carbon needed for the diamond-making process.
Another factor is diamonds may not be growing at a continuous rate for one billion to three billion years for a gem to form. With other crystals, there can be interruptions that pause the process and have the stone waiting until the perfect element arrives to start the process again, where it left off. There is a good reason that diamonds follow a similar route, so in fact, it goes to show we really do not know how long from start to finish a diamond needs to fully form.
We know that inclusions in diamonds are considered potential contaminations and are often cut around when possible. These inclusions are other minerals and knowing what those minerals are, can actually help to determine when that element was first found on Earth.
This is one way to get an idea of how old a diamond may be. Another reason diamonds are probably as old as the Earth is due to how much hotter the Earth was in the beginning and allowed for continuous conditions for diamonds to grow and thrive.
Are Diamonds Really Forever?
One might think that once a diamond is created, it is here for good. Technically, that is true and not true at the same time. Eventually, a diamond could transform into graphite, as they are both pure carbon in crystalline form.
What makes them different from each other is how the carbon structures have attached themselves to one another. Carbon in diamonds forms a three-dimensional configuration, then in graphite, the same amount of carbon forms but it’s much more loosely connected to one another.
So when a diamond begins to form into graphite, it is really just the carbon structures relaxing in their bonds. At the same time, some kind of force, or strong energy is required for the diamond to shift in its configuration, not any kind of chemical reaction with an external substance will do it.
Without this energetic force, such as a massive increase in temperature, a diamond will essentially always remain a diamond. The atoms would have to gain a specific amount of energy to loosen the bonds, to then form into graphite. Most humans will never be around the energy that’s needed for this transition to happen.
So when someone says diamonds last forever, that is technically true!
The Enduring Value of Antique Diamonds
When you hold an antique diamond, you’re holding a piece of Earth’s history. These gems are a testament to endurance, having taken between one and three billion years to form deep within the Earth's mantle under unimaginable heat and pressure. This remarkable origin story is what forges their incredible strength and gives them a profound sense of permanence. Their value also comes from their incredible journey to the surface through rare volcanic eruptions, making each one a survivor. The carbon atoms within them bonded perfectly to create the resilient structure we admire today. It’s a powerful reminder that something beautiful and enduring can emerge from immense pressure, carrying the history of its creation within its very facets.
Meet the World's Most Famous Ancient Diamonds
The Legendary Hope Diamond
The Smithsonian Natural History Museum has the Hope Diamond, which is at least one billion years old and was found in India. It is extremely uncommon to see the rock that carried the diamond through the kimberlite pipes, yet in India, there have been other rocks that scientists have been able to inspect. The ones they have found date the diamonds that were in the rocks to be one billion years old, so the Hope Diamond is more than likely even older than what is documented.
The uniqueness of the Hope Diamond is due to its size and color. Originally, it was 112 carats in a rough triangular shape, then was cut and polished to a 45.54-carat cushion cut. This stone was in the presence of kings, stolen in the French Revolution, made a few ownership changes among the wealthy, until Harry Winston ultimately donated it to the museum, where it is a main attraction.
There has been only one other gem mined that is the same size and color.
The Royal Wittelsbach-Graff
Another deep blue gem at 31.06 carats, the Wittelsbach-Graff is thought to be the sister stone of the Hope Diamond. This stone was around European royalty and disappeared a few times since its existence, to then being cut and polished to express its ultimate beauty. Afterward, the Gemological Institute of America changed the rating from fancy grayish-blue to fancy deep blue.
The Nur-ul-Ain Tiara's Diamond
Known as the Light of the Eye, this 60 carat light pink oval cut gem is the sister stone to Darya-i-Nur and also resides in Iran.
These two magnificent pink diamonds mentioned are believed to be cut from the Diamanta Grande Table, a massive table of 400 carats.
The Naturally Green Dresden Diamond
This special green gem has the same color throughout the entire stone, which is very uncommon with green diamonds. It is a 40.7-carat pear cut that was cut prior to 1741. It is believed to have come from Kollur Mine in India.
The Dresden Green accompanied the Hope Diamond from 2000-2001 at the Smithsonian Museum, when the Dresden Palance and Green Vault were receiving structural improvements. When the work was completed in 2004, this precious stone returned home and has been on display for the public ever since.
How Long Does It Take to Make a Diamond in a Lab?
Lab-grown diamonds are gaining popularity because they are conflict-free.
There are two ways diamonds grow in the lab. High Pressure High Temperature (HPHT) was the first type invented in the 1950s. This is where one diamond is grown at a time and there are three different kinds for this machine: the bars, cubic, and belt press. These machines are able to duplicate the perfect temperature and pressure that is needed to create a diamond.
The Carbon Vapor Deposition machine was developed next to be able to create multiple diamonds at one time. The only quirk with this kind of machine is that some diamonds will be smaller than others and oftentimes, there are a decent amount of inclusions that will need to be cut and polished around.
With the High Pressure High Temperature machines, it is known ahead of time what the color, size, and cut will be and can be created to those exact design elements.
At Eterneva, this is the kind of machine that we use to make cremation diamonds. We purify your loved one’s ashes or hair to extract the needed carbon, place that carbon and a diamond seed into our machines, and allow that machine to replicate the conditions under the earth to create the raw diamond. Our entire process from start to finish takes about eight months—here is what we do in a nutshell.
First, we begin with a welcome call to get to know you, your loved one and learn about what made them so remarkable.
The next step is to send us a ½ cup of ashes or hair by returning your personalized Welcome Kit. The kit includes a video message from us, cubic zirconias to see different carat size examples, a container for your loved one’s ashes or hair, and further detailed instructions.
Your loved one’s ashes are then purified to extract the necessary carbon for your diamond. The carbon purification process takes about two months, and we make sure to send video and text updates to you along the way so you can stay informed and feel confident in the process.
The purified carbon is then placed into the HPHT machine where a raw diamond is grown! Once the raw diamond has finished, it’s time to assess it and check for any inclusions that we may want to cut around. The diamond is then cut by our master cutters, and we have the diamond inspected at the International Gemological Institute for you.
Many customers are choosing to work with Eterneva to create a custom jewelry setting for their diamond, and we’d be happy to help if that is the route you’d like to go as well. After this is completed, we carefully and thoughtfully make sure your diamond is delivered back home to you.
The Science of Lab-Grown Diamonds
While the end result is a diamond identical to one from the earth, the scientific process in a lab is a fascinating and controlled marvel. It’s a way to honor the past by creating something beautiful in the present. Instead of waiting billions of years, scientists can replicate the diamond-growing environment with incredible precision. There are two primary methods used to create lab-grown diamonds, each with its own unique approach to replicating nature's work, but both starting with the essential element of life: carbon.
HPHT (High Pressure, High Temperature)
The original method, developed back in the 1950s, is called High Pressure, High Temperature, or HPHT. As the name suggests, this process recreates the intense conditions deep within the Earth's mantle where natural diamonds are born. A small diamond seed is placed into a specialized press along with a source of purified carbon. The machine then applies immense pressure and extreme heat, causing the carbon to crystallize around the seed, growing into a raw diamond. Because this method grows one precious diamond at a time, it allows for incredible precision and control over the final gem. This is the exact method we use at Eterneva to ensure your loved one's memorial diamond is grown with the utmost care and attention to detail.
CVD (Chemical Vapor Deposition)
The other common method is Chemical Vapor Deposition (CVD). This technique takes a different approach by starting with a diamond seed in a vacuum chamber. The chamber is filled with carbon-rich gases and heated to a very high temperature, which causes the carbon atoms to separate and deposit onto the diamond seed, building up the diamond layer by layer. While CVD machines can grow several diamonds simultaneously, the process can sometimes result in gems with more inclusions or variations in size. For creating a singular, deeply personal diamond that represents a unique life, the controlled environment of the HPHT method provides a more focused and predictable outcome, ensuring the highest quality.
How Long Does the Diamond Growth Process Take?
Unlike the billion-year timeline for a natural diamond, growing a diamond in a lab is a much faster process, measured in months rather than millennia. This accelerated timeline doesn't compromise the quality or authenticity of the diamond; it simply streamlines nature's process in a controlled setting. The beauty of this scientific advancement is its predictability. We can determine how long the growth phase will take based on the specific diamond you envision for your loved one, removing the guesswork and allowing us to keep you informed every step of the way as their unique diamond comes to life.
Factors Influencing Growth Time
The single biggest factor that determines how long a diamond needs to grow is its size. Simply put, a larger carat weight requires more time in the HPHT press for the carbon crystals to form and build upon the diamond seed. A one-carat diamond will take significantly longer to grow than a half-carat diamond, as more layers of carbon need to crystallize. The desired color of the diamond can also influence the timeline. Because we know the exact specifications of the diamond from the very beginning, we can precisely calculate the growth time needed to create a beautiful, high-quality gem that perfectly honors your loved one's memory and legacy.
The Eterneva Memorial Diamond Journey
From the moment we receive your loved one's ashes or hair to the day your finished diamond is returned home, the entire Eterneva journey takes about eight months. We see this as more than just a scientific process; it's a journey of transformation and remembrance that we are honored to share with you. It begins with purifying the ashes or hair to extract their unique carbon signature—the very essence of your loved one. This purified carbon is then placed in our HPHT machine with a diamond seed to begin the growth phase, which can take several months depending on your diamond's final size and color. We believe you should be a part of this incredible process, which is why we provide personalized updates with photos and videos at every milestone, from carbon purification to the final raw diamond.
Once the raw diamond is fully formed, it moves into the hands of our master cutters who meticulously shape and polish it to reveal its inner fire and brilliance. This step alone is an art form that takes weeks to perfect. After cutting, the diamond is professionally graded and can be set into a piece of custom jewelry, if you choose, to create a wearable connection to your loved one. Our unwavering commitment to transparency ensures you are a part of this remarkable transformation from start to finish, creating a meaningful heirloom that truly celebrates a life well-lived and keeps their story sparkling on.
A Diamond's Journey: From Mantle to Masterpiece
We really do not know how long it takes diamonds to form naturally on the Earth, but we do know that it takes about eight months in a lab.
In the Eterneva lab, we have world-class technicians who are experienced and well-trained in the diamond-creation process.
Sources:
The Oldest & Most Famous Diamonds In History | Arpege Diamonds
HOW DIAMONDS ARE FORMED | Capetown Diamond Museum
Why do diamonds last forever? | WTAMU
From Raw Crystal to Polished Gem
The journey of a diamond is remarkable, whether it takes billions of years or several months. Natural diamonds form under immense heat and pressure deep within the Earth's mantle, a process that can span up to a third of our planet's history. These raw crystals are then violently brought to the surface through volcanic eruptions. In a lab, we replicate these exact conditions. For a memorial diamond, we use purified carbon from ashes or hair, placing it with a diamond seed into a machine that applies the same intense pressure and temperature. This controlled environment allows a raw, unique diamond to grow, holding the same physical and chemical properties as one from the Earth, but with a story that is deeply personal from the very start.
Natural vs. Lab-Grown: What's the Difference?
When you hold a diamond in your hand, it’s impossible to tell with the naked eye whether it came from the Earth or a lab. That’s because, in every way that matters, they are the same. A lab-grown diamond isn’t a “fake” diamond; it’s a real diamond with a different origin story. Both have the same crystal structure, the same hardness, and the same brilliant sparkle. The primary difference is their journey. One is a product of geology and time, while the other is a marvel of technology that allows us to create something beautiful and meaningful in a fraction of the time, like the memorial diamonds we create to honor a remarkable life.
Identical in Almost Every Way
On a molecular level, lab-grown and natural diamonds are indistinguishable. They are both pure carbon crystallized in an isometric cubic system. This means they share the same chemical composition and physical properties, from their unmatched hardness on the Mohs scale to the way they bend and reflect light. The Federal Trade Commission (FTC) even updated its jewelry guides to classify lab-grown diamonds as real diamonds. The only true distinction lies in their origin, which is why a lab-grown diamond can offer a beautiful, ethical, and deeply personal alternative without compromising on quality or authenticity.
Subtle Distinctions for Gemologists
While you can't see a difference, a trained gemologist with specialized equipment can identify a diamond's origin. They look for tiny variations in growth patterns and trace elements. Natural diamonds often contain minute amounts of nitrogen, which can affect their color, while lab-grown diamonds might have different types of microscopic inclusions related to their manufacturing process. These are not flaws but rather signatures of their creation. At Eterneva, we embrace this transparency; every one of our pet diamonds and memorial diamonds is graded and certified, ensuring you know its unique story and quality.
Grading Diamond Quality: The 4 Cs
Every diamond, regardless of its origin, is evaluated using a universal standard known as the 4 Cs: Cut, Color, Clarity, and Carat. This grading system was established by the Gemological Institute of America (GIA) to provide a consistent way to assess a diamond's quality and value. Understanding these four factors helps you appreciate the unique characteristics of your specific gem. It’s the language jewelers and gemologists use to describe what makes a diamond sparkle, and it’s the same standard we use to ensure the quality of every memorial diamond we create.
Cut
A diamond's cut is arguably the most important of the 4 Cs because it directly influences its sparkle. It doesn’t refer to the diamond's shape (like round, oval, or pear) but to the quality of its facets, symmetry, and proportions. A well-cut diamond acts like a perfect prism, capturing light and reflecting it back in a dazzling display of brilliance and fire. A master cutter transforms a raw crystal into a faceted gem, and their skill is what brings the stone to life. You can see a variety of beautiful cuts in our gallery of settings to find the one that best tells your story.
Color
When grading white diamonds, the color scale actually measures the absence of color. The GIA scale runs from D (colorless) to Z (light yellow or brown). A completely colorless diamond is incredibly rare and valuable because, without any tint, it allows the most light to pass through, creating exceptional sparkle. Many memorial diamonds have a unique, beautiful hue—from white to blue, yellow, or even black—which comes from the specific carbon elements present in your loved one's ashes. This makes each diamond's color a deeply personal and one-of-a-kind characteristic.
Clarity
Clarity refers to the presence of tiny imperfections, known as inclusions (internal) or blemishes (external). Nearly all diamonds have them, and they are like natural birthmarks that formed during the diamond's creation. The clarity scale ranges from Flawless (F) to Included (I), where inclusions are visible to the naked eye. These characteristics make each diamond unique. While a flawless diamond is rare, many inclusions are microscopic and don’t affect the stone's beauty or durability, simply adding to its individual character.
Carat
Carat is a measure of a diamond's weight, not its size. One carat is equal to 200 milligrams. While a higher carat weight generally means a larger diamond, the stone's cut and shape can also influence its perceived size. Two diamonds of the same carat weight can appear different in size depending on how they are cut; a shallow cut might look larger than a deep one. It’s important to balance carat weight with the other Cs to find a diamond that is both beautiful and meaningful to you.
Understanding Diamond Simulants
It's important to distinguish between a lab-grown diamond and a diamond simulant. A lab-grown diamond is a real diamond in every sense—chemically and physically. Simulants, on the other hand, are stones that look like diamonds but are made of different materials. Common simulants include cubic zirconia (CZ) and moissanite. While they can be beautiful, they don't have the same properties as a diamond. They are not as hard, they reflect light differently, and they don't have the same enduring value. When you choose a memorial diamond, you are choosing a real, lasting gemstone created from a source of personal carbon.
The Effort Behind Mined Diamonds
The journey of a mined diamond is incredibly intensive. On average, miners must move 250 tons of earth to find a single one-carat gem-quality diamond. This process has a significant environmental impact and is often associated with ethical concerns. In contrast, lab-grown diamonds offer a more sustainable and transparent alternative. Creating a diamond in a lab uses a fraction of the resources and ensures a conflict-free origin. For many, especially those creating a memorial diamond, this provides peace of mind, knowing their tribute is not only beautiful but also created with care and integrity.
Frequently Asked Questions
How can a lab create a diamond in months when it takes nature billions of years? Think of it as streamlining nature's recipe. Instead of waiting for the perfect conditions to occur randomly deep within the Earth, we precisely recreate that environment of intense heat and pressure in our lab. By starting with the purified carbon from your loved one and a tiny diamond seed, we provide the exact ingredients and setting needed for a diamond to grow, condensing a billion-year geologic journey into a focused, several-month process.
Is a memorial diamond from ashes or hair considered a real diamond? Yes, absolutely. A memorial diamond is physically and chemically identical to a diamond mined from the Earth. It has the same crystal structure, the same unmatched hardness, and the same brilliant sparkle. The only difference is its origin story. It is not a simulant like cubic zirconia; it is a genuine diamond, created from a deeply personal and meaningful source of carbon.
Why does the Eterneva journey take about eight months? The eight-month timeline reflects the incredible care and precision involved in every single step. This journey includes the initial carbon purification, which is a meticulous scientific process, followed by the diamond's growth phase in our specialized machines. After the raw diamond has formed, our master cutters take weeks to carefully shape and polish it to reveal its beauty. We believe this is a journey of remembrance, not just a transaction, so we share updates with you along the way.
Will my loved one's diamond have a specific color? The color of your memorial diamond is one of its most personal and beautiful characteristics. The unique elements present in your loved one's specific carbon signature can result in a wonderful range of colors, from clear and white to shades of blue, yellow, or even black. This means the final hue is a true reflection of the individual, making their diamond genuinely unlike any other in the world.
What's the real difference between a mined diamond and a memorial diamond? While they are identical in their physical makeup, their stories are completely different. A mined diamond tells a story of ancient geology, of immense pressure and heat deep within the Earth over billions of years. A memorial diamond tells the story of a unique and remarkable life. It is grown from the actual carbon of a person or pet you loved, transforming their very essence into a beautiful, lasting tribute that you can hold and cherish forever.
Key Takeaways
- Natural diamonds take billions of years to form: This incredible timeline, happening deep within the Earth's mantle under intense conditions, makes each natural diamond a true piece of geological history.
- Lab-grown diamonds are physically and chemically real: By recreating the same high-pressure, high-temperature environment found in nature, labs can grow a diamond that is identical to a mined one.
- Memorial diamonds offer a tangible connection: The same science allows for the transformation of carbon from a loved one's ashes or hair into a unique diamond in about eight months, creating a personal and lasting heirloom.
