Almost every person who walks into the world of lab-grown diamonds arrives with the same question: are these actually the same as mined diamonds? It's a fair thing to ask. A diamond is, for most people, a once-or-twice-in-a-lifetime purchase, and the language around it has been shaped by a century of advertising that rarely lets you in on the technical detail.
This piece is our attempt to answer that question plainly, from an Australian buyer's perspective. It's not a sales pitch. It's the conversation we'd have with you if you came in to our studio with the page of notes you've been keeping on your phone.
They are the same stone
A diamond is carbon arranged in a particular crystal lattice. That's the entire definition. Whether the carbon crystallised slowly under the pressure of the earth's mantle or quickly inside a controlled laboratory chamber, the resulting stone is, chemically and optically, the same. The same hardness (10 on the Mohs scale), the same refractive index, the same dispersion that produces the rainbow flash we call fire.
Both the GIA and IGI — the two laboratories most people rely on for grading — issue certificates for lab-grown diamonds using the same 4C system used for mined stones. A jeweller using a standard handheld tester cannot distinguish between the two; only specialised equipment that reads trace nitrogen signatures or fluorescence patterns can. For everything that matters in everyday wear — the way the stone looks, the way it lasts, the way it feels — they are interchangeable.
Where they come from
The honest difference is origin. A mined diamond formed somewhere between one and three billion years ago, was carried to the earth's surface by ancient volcanic activity, and at some point in the last hundred and fifty years was extracted, sorted, polished, traded, and brought to a counter near you. That journey usually passes through five or six countries before the stone reaches your hand.
A lab-grown diamond is produced in weeks rather than millennia, in a sealed chamber that recreates either the high-pressure-high-temperature conditions of the mantle (HPHT) or, more commonly today, deposits carbon atom by atom from a methane plasma onto a tiny seed crystal (CVD). The supply chain from chamber to certified, polished stone is short and easy to verify.
The environmental difference
Mining a single carat of natural diamond requires the displacement of roughly 250 tonnes of earth, the use of around 480 litres of water, and the emission of approximately 57 kg of CO2-equivalent, based on industry data published by the Trucost ESG study commissioned by the Diamond Producers Association. These numbers vary by mine, and the cleaner mines have improved meaningfully over the past decade — but the floor cost in land, water and emissions is structural.
A lab-grown diamond produced in modern facilities, particularly those powered by renewable energy, uses a fraction of those resources. The chamber itself is the size of a small fridge. There is no overburden to displace, no tailings dam to manage, no community displacement. The number that gets disputed is energy use — some older facilities run on coal-grid electricity, which materially reduces the gap. We choose suppliers that grow in facilities using grid-renewables wherever possible, and we'd encourage any buyer to ask their jeweller the same question.
Ethics and provenance
The Kimberley Process, established in 2003, was intended to keep so-called blood diamonds out of the legitimate supply chain. In practice, it certifies country of origin rather than the conditions under which the stone was mined, and most observers — including, in 2011, the founder of the process itself — now consider it insufficient. Mined diamonds can be ethically sourced, but verifying that for any individual stone requires significant trust in the chain.
Lab-grown removes the question. The chamber is the origin. There is no possibility of conflict funding, no question of mining-community impact, no chain to audit. For buyers who want certainty without doing forensic work, this is the clearer answer.
The diamond is the same. The origin is transparent. The price reflects what the object actually is.
The price difference
This is where the gap becomes obvious. As of June 2026, in the Australian market, a 1-carat IGI-certified round brilliant lab-grown diamond of comparable F-colour and VS1 clarity sits in the range of AU$1,800 to AU$3,500 depending on cut quality and supplier. The equivalent mined diamond at the same specifications typically runs between AU$8,500 and AU$14,000.
The reason is simple supply economics. Mined diamond inventory is constrained by what can be extracted; lab-grown supply has expanded rapidly over the past five years, and the cost of growing has fallen as the technology has matured. For the buyer, this means you can either save substantially on the same stone, or step up significantly in carat, colour or cut for the same budget. Most of our clients choose the second.
A note on resale value
We should be honest about this. The secondary market for both mined and lab-grown diamonds is much smaller than the marketing has historically suggested. Re-sellers and pawn brokers offer a fraction of the retail price for either category, and the gap between what you paid and what you can sell for is wide for natural diamonds as well — it just gets discussed less.
A diamond purchase, in our view, is not an investment. It's an object you intend to wear and to keep. The right way to buy is the same regardless of category: choose a stone you'll love the look of every day, choose a setting that will outlast trends, and choose a maker who can resize, polish, and reset for you decades from now.
Why we chose lab-grown
Lune Diamond was built around lab-grown stones because, on the four questions that matter to most buyers — what is it made of, where did it come from, what did it cost the world to make, and what does it cost you — the lab-grown answer is the more honest one. The stone is the same. The origin is transparent. The environmental footprint is materially smaller. The price reflects what the object actually is, not what it has been historically marketed as.
Every centre stone in our collection is IGI or GIA certified, grown in modern facilities, and set in solid 18-karat or platinum bands made to order in Australia. None of that requires you to give anything up on the wearing experience — the stone you put on your finger looks, refracts and lasts exactly as a diamond should.
Where to go from here
If you want the technical detail on how our stones are grown and certified, our Lab-Grown Diamonds page covers the process in depth. If you're ready to look at finished pieces, our Engagement Rings collection is the most useful starting point — every piece can be made in white, yellow or rose 18k gold, or platinum, and every stone is paired to a setting designed in Sydney.
Any question you'd rather ask a person, you can reach us at contact@lunediamond.com. We answer within one business day.