Hair is primarily keratin/protein and contains substantial carbon before carbonization. Published elemental analyses commonly report around half its dry mass as carbon.
How Memory Diamonds Are Made
Black Jack® Memory · Real CVD Science
From Personal Carbon to Diamond Crystal.
A CVD laboratory-grown diamond grows on a real diamond seed from reactive carbon species created inside a hydrogen-rich plasma. New carbon is incorporated into the crystal lattice repeatedly— building the rough diamond layer by layer at the atomic scale.
The personal hair or cremation-ash workflow happens before the CVD crystal-growth stage. Hair or ashes are not simply placed beside the diamond seed inside the chamber.
Carbon Sample ID Carbon Preparation Diamond Seed H₂ + CH₄ Microwave Plasma CVD
End-to-End Logic Sample → Carbon → Plasma → Crystal
Scientific rule this page follows: conventional gem-quality CVD is a gas-phase deposition process. A diamond seed is exposed to hydrogen-rich carbon chemistry—commonly H₂ with a small hydrocarbon fraction such as CH₄—inside a low-pressure plasma reactor. If a Memory Diamond business states that recovered customer carbon becomes part of this growth feed, the laboratory must actually have a documented conversion/incorporation route for that recovered carbon. Website copy should never invent that missing step.
Before the Process
Four facts that matter scientifically.
High-temperature cremation removes most organic material. The resulting bone ash is mineral-rich and remaining carbon/carbonate is much more variable than in hair.
Gem CVD diamond grows from carbon-bearing gas species reacting at a hot diamond seed surface inside a plasma reactor.
Standard gemological testing can identify laboratory growth and grade the diamond, but it does not prove which person supplied individual carbon atoms.
Step-by-Step · Real Logic
Start with the sample. End with a finished diamond.
Each stage below has a different scientific purpose. The sample-processing stage should not be confused with the actual CVD growth stage.
01
Receive, Match & Log
TraceabilityThe approved hair or cremation sample is received and matched to the order under its Carbon Sample ID.
- Shipment tracking and package condition checked
- Inner sample reference matched to the order
- Sample source category recorded
- Chain-of-custody / handling record begins
Scientific workflow illustration — not presented as a photo of Black Jack’s facility.
02
Characterize the Source
Hair ≠ AshesHair and cremated bone cannot be treated as the same starting chemistry. Hair is organic and carbon-rich; fully cremated bone is mainly mineral.
- Hair: moisture, contamination and carbonization route reviewed
- Ashes: mineral-heavy matrix with variable residual/carbonate carbon
- Usable carbon should be measured instead of assumed
- Source-specific laboratory SOP determines the next step
Hair and cremated remains need different recovery assumptions and quality checks.
03
Carbonize / Recover & Purify Carbon
Lab-Specific SOPThe goal is to isolate usable carbon while reducing unwanted water, organics, sulfur/nitrogen compounds, minerals and metals.
- Organic source can be carbonized under controlled conditions
- Selected mineral contaminants may be removed chemically
- Washing, filtration and drying can follow purification
- Exact reagents and temperatures must match the actual lab method
Process schematic. The actual chemistry must follow Black Jack’s real laboratory SOP.
04
Carbon QC & Mass-Balance Gate
EvidenceBefore any claim that customer carbon enters the growth process, recovered carbon should be quantified and linked to the next production stage.
- Recovered carbon amount documented
- Purity / inorganic residue checked where applicable
- Material entering the precursor pathway recorded
- Do not claim “100% from ashes/hair” unless genuinely validated
Material traceability is stronger than a label alone when a source-contribution claim is made.
05
Prepare a CVD-Compatible Carbon Precursor
Critical Integration StepThis is the scientifically important bridge between recovered personal carbon and conventional CVD growth. A CVD reactor needs gas-phase carbon chemistry.
- Standard gem CVD commonly uses methane (CH₄) in hydrogen
- Solid ash or graphite is not simply placed next to the seed
- If recovered customer carbon is used as growth carbon, the laboratory needs a real conversion/incorporation route
- The public website should describe only the route the laboratory actually uses
This bridge must reflect the actual laboratory process before it is stated as a factual customer claim.
06
Prepare the Diamond Seed
Crystal TemplateGem-quality single-crystal CVD is normally grown on a polished single-crystal diamond seed plate.
- Diamond seed selected for geometry and orientation
- (100)-oriented surfaces are widely used in single-crystal CVD
- Growth face is polished and cleaned
- Seed is mounted on the substrate holder
The seed provides the lattice template for homoepitaxial single-crystal growth.
Step 07 · Inside the CVD Chamber
Hydrogen + methane + microwave energy create the growth plasma.
Modern gem CVD commonly uses a microwave plasma reactor. Hydrogen is the dominant process gas and a small hydrocarbon fraction—usually methane—provides carbon.
Microwave energy couples into the low-pressure gas and creates a plasma containing electrons, hydrogen atoms, hydrocarbon radicals, ions and molecules. Those reactive species control what happens at the hot diamond seed surface.
Hydrogen (H₂) Usually the dominant feed gas. Atomic H is fundamental to diamond-selective surface chemistry.
Methane (CH₄) A common carbon-containing precursor used in gem-quality CVD recipes.
Microwave Plasma Generates energetic electrons, H atoms, radicals and ions that drive chemistry.
Diamond Seed The crystal template where new sp³ diamond material is deposited.
Step 08 · Atom-by-Atom Growth
How carbon becomes part of the diamond lattice.
This is a simplified educational view of the widely used hydrogen-abstraction / methyl-radical model. Real plasma chemistry is more complex and contains many simultaneous reactions.
The hot diamond surface is stabilized by bonded hydrogen atoms.
An H atom can remove a surface H, leaving a reactive carbon site.
Methyl radical (CH₃) is a principal growth precursor in standard H₂/CH₄ models.
Further abstraction, radical addition and bond rearrangement incorporate carbon into diamond-lattice positions.
These reactions repeat across atomic steps and terraces, producing measurable crystal growth over time.
Why atomic hydrogen is important: it helps create reactive growth sites and preferentially removes non-diamond/sp² carbon. That is why a hydrogen-rich environment is central to conventional diamond CVD chemistry.
Real Science vs Fake Shortcut
What should be shown to a customer.
Scientifically Defensible
- Laboratory-grown diamond created by CVD.
- Diamond grows on a real diamond seed.
- Hydrogen-rich gas and a carbon-bearing gas such as methane feed the reactor.
- Microwave plasma creates reactive species.
- Carbon is incorporated into the sp³ diamond lattice layer by layer.
- Personal-carbon handling is an upstream documented process.
- Any personal-carbon feed claim must match the actual laboratory SOP.
Do Not Show as “Science”
- Hair strands sitting next to a diamond seed inside the CVD chamber.
- Ash powder melting directly into the growing diamond.
- A graphite chunk touching the seed and automatically becoming CVD diamond.
- “Every atom is from the customer” without a validated closed-carbon system.
- “Gem certificate proves whose ashes made the stone.”
- Fixed rules such as “4 mm growth always = 1 carat.”
Steps 09–16 · After the Reactor
CVD produces rough diamond crystal. Finishing comes next.
Rough crystal is removed and checked for dimensions, morphology, inclusions, stress and usable growth.
Graphitic/non-diamond edge material or damaged surface may be removed before further processing.
The crystal can undergo another prepared CVD growth cycle if more usable rough is required.
Some CVD diamonds may receive a disclosed annealing/treatment step to alter or improve color.
The rough is scanned and planned for final shape, inclusions, proportions and cutting yield.
The rough is separated, shaped, faceted and polished to produce the final diamond.
Final specifications are checked and Black Jack authenticity documentation is prepared. Independent grading is separate where ordered.
The loose diamond is packed or set into the selected jewelry, final-QC checked and shipped with tracking.
Real CVD FAQ
Questions customers usually ask.
Are the hair or ashes placed inside the CVD chamber?
Not as raw hair strands or ash powder beside the seed. Standard gem CVD is a gas-phase process. The personal sample must first go through the applicable preparation/purification workflow, and any claimed use of recovered carbon in the growth feed must match the actual laboratory process.
What gases are used in CVD diamond growth?
Conventional gem-quality CVD commonly uses a hydrogen-rich gas mixture with a small carbon-containing hydrocarbon fraction, usually methane.
What does the microwave plasma do?
Microwave energy sustains a plasma containing energetic electrons and reactive species such as atomic hydrogen and hydrocarbon radicals. These species drive the gas-phase and surface reactions required for diamond deposition.
Why is a diamond seed required?
The seed is an existing single-crystal diamond substrate. New carbon atoms extend that crystal lattice, allowing a larger single-crystal CVD diamond to grow.
Does one carbon atom really attach at a time?
At the microscopic level, crystal growth occurs through surface chemical reactions that add carbon into lattice positions. “Atom-by-atom” is a useful description, although huge numbers of reactions happen across the surface simultaneously.
Can a certificate prove which person's carbon is in the diamond?
Standard gemological grading cannot prove personal source identity. Black Jack's Carbon Sample ID and authenticity documentation can document the company's sample handling and order record, but that is different from forensic source identification.
Why can the same carat take different growth time?
Growth time depends on seed dimensions, reactor recipe, growth rate, interruptions, crystal quality, target rough geometry and final cutting yield. There is no universal fixed “days per carat” rule.
Is the final stone a real diamond?
A properly grown CVD stone is a laboratory-grown diamond with the diamond crystal structure and physical/chemical characteristics of diamond. It must be clearly disclosed as laboratory-grown rather than mined.
Scientific Basis
Primary references behind the CVD explanation.
GIA — Laboratory-Grown Diamonds: 2024 Update
Describes CVD as a gas-phase process using hydrogen and hydrocarbon (typically methane) over diamond seeds, with microwaves activating plasma. View reference →
GIA — CVD-Grown Synthetic Diamonds, Part 1
Explains activated carbon-hydrogen species moving across a diamond seed and making seeded growth one carbon atom thicker. View reference →
GIA — Man-Made Diamonds Q&A
Explains methane breakdown into carbon/hydrogen species and deposition onto diamond seeds. View reference →
CVD Growth Mechanism Literature
Experimental and modeling work supports a major role for methyl radicals and atomic hydrogen in conventional diamond CVD surface chemistry.
Hair Carbon Literature
Published materials research reports human hair as carbon-rich and approximately ~51% carbon in representative elemental analyses.
Thermally Altered / Cremated Bone Literature
Studies show high-temperature burning removes organic material and changes/removes bone carbonate, making residual carbon in cremated material process-dependent and variable.
Related Black Jack Guides
Follow the complete Memory Diamond workflow.
Memory Diamond Process Support
Need the process used for your specific order?
Contact Black Jack with your Order ID and Carbon Sample ID. The applicable growth method, specification, processing stage and certificate options can then be matched to the correct order record.
Email Memory Diamond Support →