Cremation Diamonds Explained: How Ashes Become a Diamond

A cremation diamond is created by extracting carbon from a small portion of ashes and, under intense heat and pressure in a specialist laboratory, growing that carbon into a genuine diamond — a process that closely mirrors how natural diamonds form deep within the earth, just compressed into a matter of months rather than millions of years.

The process, step by step

  1. Carbon extraction — a small portion of ashes (or in some cases, hair) is processed to extract usable carbon.
  2. Purification — the carbon is purified to laboratory-grade quality suitable for diamond growth.
  3. Diamond growth — the purified carbon is subjected to high pressure and high temperature (HPHT) conditions, closely replicating natural diamond formation, causing a diamond crystal to gradually grow.
  4. Cutting and polishing — once grown, the diamond is cut and polished by a gemmologist, just like a natural or lab-grown diamond.
  5. Setting — the finished diamond is set into a ring, pendant, or other jewellery of your choosing.

How long does it take?

The full process typically takes several months from start to finish, given the time required for careful, controlled diamond growth plus cutting, polishing and setting.

What determines the outcome

  • Size — larger diamonds require more carbon and longer growth time, and cost more.
  • Colour — cremation diamonds can range from clear to yellow or blue tones, depending on trace elements and the specific process used.
  • Clarity — like natural diamonds, clarity varies and affects overall price.

Is it right for your family?

A cremation diamond is a significant, meaningful investment best suited to families who want a single, permanent piece of fine jewellery. See our comparison of cremation diamonds vs standard cremation jewellery to weigh up whether it's the right fit.

Frequently Asked Questions

How is a cremation diamond made from ashes?

Carbon is extracted and purified from a small portion of ashes, then grown into a diamond crystal under high pressure and high temperature conditions in a specialist laboratory, before being cut, polished and set.

How long does it take to make a cremation diamond?

The full process typically takes several months, covering carbon extraction, diamond growth, cutting, polishing and setting.

What colour are cremation diamonds?

They can range from clear to yellow or blue tones, depending on trace elements present and the specific growing process used.

How much ash is needed to create a cremation diamond?

Only a small portion of ashes is required, as the process extracts and purifies carbon rather than using the ash itself directly.

At Premium Urns, we help Australian families find a memorial that feels right, without any pressure. Explore our full range of cremation jewellery online, or get in touch with our team if you'd like a hand choosing.

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