Technology -CVD
SFS Technology is a high-tech leader specializing in Chemical Vapor Deposition (CVD) technology, transforming bone ashes or hair into high-purity, lab-grown diamonds. As a heavy-asset company, we own and operate our state-of-the-art chemical laboratory and CVD factory, ensuring full control over quality and innovation. Our advanced CVD process offers superior purity, consistency, and precision, setting us apart from traditional HPHT methods. At SFS Technology, we blend cutting-edge science with deep emotional significance, providing a personalized and sustainable way to preserve cherished memories in the form of unique, everlasting diamonds.
Essence of Life - Carbon
Bone ashes typically contain 3–9% carbon, with calcium phosphate comprising 80–90% of the composition, along with other trace minerals. In contrast, human and pet hair contain approximately 45–50% carbon, making them significantly richer sources for diamond transformation. Carbon, the fundamental building block of life, is present in all living beings and remains even after passing. Whether from bone ashes or hair, the carbon essence of a loved one endures, allowing it to be transformed into a memorial diamond—an everlasting tribute that embodies both life and memory.
Diamonds: The Purest Form of Carbon
Diamonds are made entirely of carbon, with atoms arranged in a strong crystalline lattice under extreme pressure and heat. This unique structure gives diamonds their hardness, brilliance, and clarity.
Chemical Vapor Deposition
Chemical Vapor Deposition (CVD) is an advanced process for creating high-purity diamonds by depositing carbon atoms layer by layer onto a diamond seed. In a vacuum chamber, a carbon-rich gas and the carbon gas transformed from bone ashes are introduced and broken down using high-energy microwaves or plasma. The freed carbon atoms settle on the seed, gradually forming a diamond. This high-tech, highly controllable method allows for precise customization, producing near-colorless, impurity-free diamonds without the need for metal catalysts. Though more complex than HPHT, CVD ensures superior purity, consistency, and scalability, making it the preferred choice for lab-grown diamonds, including memorial diamonds from bone ashes.
Why CVD Technology is Superior for Transforming Bone Ashes into Diamonds
As a company specializing in the Chemical Vapor Deposition (CVD) method, we recognize its advanced technological capabilities and precise control in creating high-quality diamonds from bone ashes. While High-Pressure High-Temperature (HPHT) has been a traditional method, CVD offers a more modern, high-tech approach with better control over purity, quality, and customization. However, the process is more challenging and requires specialized expertise.
Key Advantages of CVD Over HPHT
CVD Machines
Although CVD is a more challenging and sophisticated process, its superior precision, high purity, and controllability make it the best choice for transforming bone ashes into diamonds. As a high-tech company, we are committed to using the most advanced diamond-growing methods to ensure every memorial diamond is a perfect, high-quality tribute to a loved one.
Precision and Care Production
we understand that a memorial diamond is more than just a gemstone—it’s a cherished tribute to a loved one. That’s why we have developed a highly controlled, traceable, and precision-driven process to ensure that the carbon from bone ashes or hair is carefully transformed into a pure, high-quality diamond.
Carbon extraction video
Step 1: Carbon Extraction & Purification
From the moment we receive the ashes or hair, each sample is securely labeled and tracked with a unique identification system. Every step of the process is documented, ensuring that the exact carbon from your loved one is used in the creation of the diamond. We never mix sources, guaranteeing absolute authenticity.
The process begins with the careful collection of bone ashes or hair. Since bone ashes contain only 3–9% carbon, while hair holds 45–50%, we use advanced chemical purification to extract and super-concentrate the carbon, ensuring a high-purity source for diamond growth.
1.1 Labeling & Tracking with Identification System - To ensure full traceability, each sample of bone ashes or hair is securely labeled and assigned a unique identification code. This system guarantees that every step of the process is accurately documented, ensuring that the extracted carbon is correctly linked to the original sample throughout production.
1.2 Grinding the Sample to Increase Reaction Surface - The received sample undergoes precision grinding to increase its surface area, allowing for more efficient chemical reactions in the subsequent purification steps. This step is crucial to ensure that carbon extraction is uniform and complete.
1.3 Chemical Purification to Extract Carbon Elements - Through wet chemical purification, impurities such as calcium phosphate and trace minerals are removed, leaving behind a highly concentrated carbon source. This process is conducted in a controlled chemical environment, ensuring maximum carbon purity for diamond synthesis.
1.4 High-Temperature Treatment in an Inert Atmosphere - To further purify the extracted carbon, the sample is placed in a high-temperature oven under oxygen-free conditions, preventing unwanted oxidation. This step ensures that the carbon is fully purified and ready for transformation. At this stage, the carbon is in its purest form, free from non-carbon residues.
1.5 Vaporization of the Sample to Obtain Carbon Gas - The purified carbon is then subjected to vaporization, converting it into carbon gas, which is essential for the Chemical Vapor Deposition (CVD) diamond growth process. This controlled conversion ensures that the carbon atoms are optimally prepared for diamond crystallization in the next phase.
This highly precise, traceable, and scientifically controlled purification process ensures that only the carbon from the original sample is used to create the final memorial diamond, maintaining authenticity, quality, and emotional significance.
Step 2: Chemical Vapor Deposition (CVD) Diamond Growth Process
After the carbon purification process, the extracted carbon undergoes Chemical Vapor Deposition (CVD), a highly controlled, high-tech method for growing pure, high-quality diamonds. This process allows precise control over the diamond’s formation, ensuring exceptional clarity, purity, and authenticity.
2.1 Preparing the Diamond Seed - The CVD process begins with a high-purity diamond seed, typically a thin sliver of an existing diamond. This seed serves as a foundation for the new diamond to grow upon. The seed is carefully inspected and placed in a high-vacuum reaction chamber to ensure a clean growth environment.
2.2 Introducing Carbon Gas into the Reactor - Once the reaction chamber is sealed, a precisely controlled mixture of carbon-rich gases (includes the extracted carbon) is introduced. These gases provide the necessary carbon atoms that will crystallize into a diamond structure.
2.3 Plasma Activation for Carbon Atom Deposition - Inside the chamber, high-energy microwave plasma is used to break down the gas. This creates an ultra-high-energy environment where the carbon atoms become highly reactive and ready to bond onto the diamond seed.
2.4 Layer-by-Layer Diamond Growth - The freed carbon atoms gradually settle onto the diamond seed, arranging themselves into a perfect crystalline lattice structure. This process is extremely precise and slow, with the diamond growing atom by atom to ensure high purity and structural integrity. The growth conditions, including temperature, gas ratio, and chamber pressure, are continuously monitored to ensure optimal diamond formation.
2.5 Controlled Growth Duration and Thickness - The CVD growth process typically lasts from weeks to months, depending on the desired diamond size. Because of its controlled nature, CVD allows for customization in terms of diamond size, thickness, and overall quality. Unlike HPHT-grown diamonds, CVD diamonds are naturally purer and have fewer inclusions since no metal catalysts are used.
2.6 Post-Growth Treatment and Final Refinement - Once the diamond reaches the desired size, it undergoes careful cooling and extraction from the chamber. Some CVD diamonds may have a natural brownish tint due to internal stress during growth and some residual from the extracted carbon gas.
step 1 ：marking
Step 2 : Scan
Step 3 : Design
Step 3：Our Crafting Workflow
ensure the quality
Once the CVD diamond has fully grown, it undergoes a meticulously controlled finishing process to bring out its maximum brilliance, ensuring that each memorial diamond is a flawless and everlasting tribute.
3.1 Marking： Marking is performed on the rough diamond to indicate the optimal cutting areas and directions. This step is based on the natural shape and internal structure of the rough stone, aiming to maximize the retention of gem weight while avoiding internal flaws. Marking forms the foundation of the entire processing workflow, directly influencing the final size, shape, and value of the diamond.
3.2 Scan: High-precision 3D scanning technology is employed to capture a complete digital model of the rough stone. This model reveals critical information such as internal fractures and inclusions, providing scientific guidance for subsequent design and cutting stages. It ensures that every memorial diamond achieves the highest possible quality.
3.3 Design：Based on the scanning data and marking results, professional designers create the most suitable cutting and polishing plan. During this stage, careful balance is struck between maximizing weight retention, achieving optimal optical performance (fire, brightness, and scintillation), and attaining the desired final shape. Emotional elements are also considered, and customized shapes such as heart, round, or emerald cuts may be designed according to client preferences.
step 4 ：Laser Cut
step 5 ：Polish
step 6 ：Quality control
3.4 Laser Cut：Using high-energy laser technology, the diamond is precisely rough-cut according to the design plan. Compared to traditional mechanical cutting, laser cutting ensures cleaner surfaces and minimizes fractures, effectively protecting the precious carbon crystal derived from ashes or hair.
3.5 Polish：This stage involves the preliminary shaping of the diamond using specialized equipment, also known as “forming polishing.” The rough diamond is ground into a basic outline, such as a round, square, or custom-designed shape. This process smooths out coarse surfaces and lays the groundwork for the fine cutting and polishing that follow.
3.6 Quality control：After the polishing process is completed, each memorial diamond undergoes a rigorous inspection.Professional gemologists conduct multiple rounds of examinations based on diamond grading standards, such as the 4Cs — Color, Clarity, Cut, and Carat Weight.This ensures that the diamond meets the highest standards in appearance, structure, and quality, and is worthy of carrying its unique emotional significance.
At SFS Technology, we take pride and responsibility in ensuring that every memorial diamond is a true and lasting representation of love and remembrance. From carbon extraction to final certification, our process is fully traceable, guaranteeing that the diamond you receive is authentically created from the ashes or hair of your loved one—because we care.