Can you turn ashes into a diamond? Here's how it actually works
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The short answer is yes — and it's not a gimmick. Memorial diamonds are real diamonds, grown from the carbon found in human ashes or hair. The science behind them is the same science used to grow diamonds for the jewellery industry, adapted for a very different purpose.
If you've come across this idea and want to understand whether it's genuinely possible — and how — this post explains the full process plainly.
Where does the carbon come from?
Everything organic contains carbon, and human remains are no exception. Hair is particularly carbon-rich, containing around 45–50% carbon by weight. Cremated ashes contain less — most of the organic carbon is lost during the cremation process itself — but enough remains to work with, supplemented by any hair provided.
Only a small amount of ashes or hair is needed, a small fraction of what a family typically receives after cremation. Aquamation remains can be used too, though about twice as much is needed. We'll confirm the exact amount for your chosen diamond before you send anything.
Step one: carbon extraction
The first stage is purifying the carbon from whatever material is provided. The ashes or hair are treated to remove non-carbon elements — minerals, salts, and other compounds present in bone. What remains is further processed to concentrate the carbon.
The goal is to reach a very high carbon purity — the standard required to grow a high-quality diamond. The colour of the final diamond is partly determined at this stage: when nitrogen traces remain in the carbon, the diamond will grow with a yellow tint. When the carbon is purified to remove nitrogen, the result is a colourless diamond.
Step two: diamond growth
Natural diamonds form deep underground when carbon is exposed to extreme pressure and temperature over millions of years. Memorial diamonds replicate this process in a laboratory using a method called HPHT — High Pressure, High Temperature.
A tiny diamond seed crystal is placed at the base of a growth chamber. The purified carbon from your loved one's ashes is placed above it, along with a metal catalyst. The chamber is then heated to over 1,400°C and subjected to pressures exceeding 50,000 atmospheres — conditions that mimic what happens kilometres below the Earth's surface.
Under these conditions, the molten catalyst dissolves the carbon and transports it onto the diamond seed, where it crystallises atom by atom. Over several weeks, a rough diamond grows.
The result is a real diamond — not a simulant, not glass, not resin. It has the same chemical composition, the same crystal structure, and the same physical properties as a diamond formed in nature.
Step three: cutting and polishing
The rough diamond that emerges from the growth chamber looks nothing like the finished stone. It needs to be cut and polished by a skilled diamond cutter to reveal its brilliance.
The most popular cut for memorial diamonds is the round brilliant — 58 facets arranged to maximise how light moves through the stone. The cutting process is carried out to the same standards applied to any fine diamond.
Step four: optional independent grading
Once cut and polished, the diamond can be sent to an independent gemological laboratory for grading. At Endura Diamond, IGI grading — from the International Gemological Institute, one of the world's most respected diamond grading bodies — is available as an optional extra for $199 including GST, on diamonds from 0.2ct.
An IGI report confirms the diamond's carat weight, cut, colour, and clarity, and verifies that the stone is a real diamond. It does not, and cannot, distinguish between a diamond grown from ashes and one grown from any other carbon source — that assurance comes from how your loved one's remains are tracked through every step.
How long does it take?
From the time your ashes or hair arrive at the laboratory, the process typically takes around three months for a colourless diamond with Endura Diamond, or around five months for a coloured diamond. Many international providers quote seven to twelve months or longer. Read more in how long it takes to make a diamond from ashes.
Is it really the same person?
This is the question most families want answered, and it's worth being honest about.
The carbon extracted from your loved one's ashes or hair does become the material from which the diamond grows. The diamond is genuinely made from their remains. At the same time, the purification process means the final stone doesn't contain DNA or any biological markers — it's carbon, in crystalline form.
Whether that matters depends entirely on what the memorial means to you. Many families find enormous comfort in knowing the physical substance of their loved one has been transformed into something permanent and beautiful. Others place more weight on the intent and meaning of the gesture. Both responses are completely valid.
What does it cost?
Prices vary by size. At Endura Diamond, memorial diamonds start from $1,490 for a 0.1ct stone, including GST, return postage, and all processing. Optional IGI grading is $199 on diamonds from 0.2ct.