What happens to ashes after cremation in Australia?
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Losing someone is hard enough. When it comes to the practical decisions that follow — what to do with their ashes — many families find themselves unsure of where to start, or even what cremation ashes actually are.
This post explains what happens during cremation, what the ashes consist of, and the different ways Australians choose to honour them. There are no wrong answers here — only what feels right for you and your family.
What actually happens during cremation?
Cremation is a process that uses high heat — typically between 760°C and 980°C — to reduce the body to its basic elements. The process takes two to three hours in a cremation chamber, sometimes called a retort.
Once the chamber has cooled, what remains is bone fragments. These are processed into the fine, grey-white powder most people recognise as ashes. The term "ashes" is a little misleading — the material is almost entirely bone mineral, mostly calcium phosphate, rather than ash in the traditional sense.
The remains are placed in a temporary container or an urn chosen by the family, then returned to the next of kin, usually within a few days of the cremation.
How much will there be?
The amount varies depending on the person's bone density and body size. On average, adults produce around 1.5 to 2.5 kilograms of cremated remains, which fills roughly the volume of a small cereal box.
This is worth knowing because it affects your options. Most meaningful tributes — including memorial diamonds — use only a small portion of the total ashes, leaving the rest for other purposes.
What do families in Australia do with ashes?
There's no single tradition in Australia, and the law gives families meaningful flexibility. Here are the most common choices:
Keeping them at home Many families keep the ashes in an urn or decorative container at home — somewhere meaningful, like a mantelpiece or a quiet corner of a room. It's a private and personal choice that keeps a loved one present in everyday life.
Scattering them Scattering ashes in a meaningful place — a beach, a garden, bushland, a sporting ground — is one of the most popular choices. In Australia, scattering on private land requires permission from the landowner, and some public places have specific rules. Most states permit scattering at sea, provided it happens a reasonable distance from shore.
Interring them Many cemeteries across Australia offer ash interment, either in a dedicated ash plot, a columbarium niche, or alongside an existing family burial. This gives families a fixed place to visit.
Dividing them It's entirely possible — and quite common — to divide ashes among family members, or to use a portion for one purpose and keep the rest for another. Each family member might choose differently, and that's okay.
Transforming them into something lasting Some families choose to transform a portion of the ashes into something tangible that can be worn, held, or passed down. Memorial diamonds are one of the most meaningful of these options — a real, certified diamond grown from the carbon in your loved one's ashes or hair.
Is there a time limit on deciding?
No. There's no legal requirement in Australia to make a decision about ashes within a set timeframe. Many families keep ashes for months or years before deciding what to do — or they make no formal decision at all. What matters is that the choice, whenever it comes, feels right.
If you're not ready to decide, that's completely understandable. Grief doesn't move to a schedule.
Thinking about something lasting
If the idea of creating something permanent from your loved one's ashes resonates with you, a memorial diamond might be worth exploring. A small amount of ashes or hair — around 100 grams or 2 grams respectively — is all that's needed to grow a real, IGI-certified diamond.
It's a choice that doesn't require you to let go. The diamond can be worn every day, passed to the next generation, or simply kept somewhere safe — a piece of someone, held in carbon, for as long as diamonds last.