Lab-Grown vs Mined Diamonds | An Honest Guide | ARKH

Lab-grown vs mined diamonds — an honest guide from a 25-year diamond family

My family has been in diamonds for 25 years. Three generations of designers, cutters, and certification specialists, all of them working — to this day — only with mined diamonds. I'm the first to make a different choice.

When I started ARKH in Australia, I made a deliberate decision: Radiance, our diamond line, would be lab-grown by default. Not because lab-grown is automatically better, and not because mined diamonds are automatically worse. But because, after a quarter of a century inside the diamond trade, I had seen enough to know which direction I personally wanted to move in. And because the Australia I was building ARKH for — the people I'd be designing for — were asking better questions than the industry had been answering.

This article is what I'd tell a friend who asked me, over coffee, which one they should choose. It's not written to sell you a lab-grown diamond. It's written so you can make a decision you won't second-guess in ten years.

What's actually different between them

Let's start with what isn't different. A lab-grown diamond is, atom for atom, the same as a mined diamond. Pure crystallised carbon. Same hardness (10 on the Mohs scale — the hardest naturally occurring substance, and the hardest synthetic one). Same refractive index, the same fire, the same sparkle, the same chemistry. A trained gemologist cannot tell them apart by eye. Certification labs use specialised equipment to identify the origin, but for the wearer, the lifetime experience is identical.

What's different is the journey the stone took to your finger.

A mined diamond

Comes from the earth. Typically billions of years old, formed under heat and pressure deep below the surface, brought up by ancient volcanic activity. Sourced from mines — most commonly in Botswana, Russia, Canada, Australia (until the Argyle mine closed in 2020), and a handful of other countries. Then cut, polished, certified, and traded through a multi-tiered global supply chain before reaching a retailer.

A lab-grown diamond

Is grown in a controlled environment, usually over four to ten weeks, using one of two processes — HPHT (high pressure, high temperature, replicating the conditions deep underground) or CVD (chemical vapour deposition, where carbon atoms are deposited onto a diamond seed). Then cut, polished, and certified by the same labs that certify mined diamonds. The chemistry is identical. The history is not.

In plain terms

Both are real diamonds. The difference is provenance, not material. One came from the ground; one came from a lab. Everything else — hardness, sparkle, longevity — is the same.

Why I chose lab-grown for ARKH (and why my family still hasn't)

My father, and my brother work with mined diamonds. They have for decades. They source them ethically — traceable supply chains, long-standing relationships with cutters and dealers they've known for thirty years. Their work is good and the diamonds they sell are beautiful.

When I started ARKH in Melbourne, I had a choice to make. I could continue the family practice, drawing on those same supply chains. Or I could try something different.

I chose lab-grown for three reasons, and I'll be honest about all of them.

The ethical question, taken seriously

The diamond industry has done significant work to clean up its sourcing since the early 2000s. The Kimberley Process exists, traceability is better, and the worst abuses have receded. Anyone who tells you all mined diamonds are blood diamonds is selling you something.

But "better than it was" is not the same as "good." Mining has environmental costs — land disruption, water use, energy consumption to extract and transport. Even ethically sourced mined diamonds carry that footprint. Lab-grown diamonds do too — they're not impact-free; they use significant energy to produce. But the energy can be sourced from renewables, the production is contained, and there's no extraction at all. For me, that mattered.

The ageing of the question

I'm 30-something, designing for people in their 20s, 30s and 40s. The conversation about how things are made is louder now than it was when my father started. People want to know where the gold came from. They want to know who made the piece. They want to look at a ring and feel that every part of it sits well with them. Lab-grown diamonds answer one of those questions cleanly. That mattered to my customers, which meant it had to matter to me.

Honesty about price

Lab-grown diamonds cost less. A 1-carat round brilliant lab-grown from ARKH typically starts around AUD $1,000 for the stone alone; an equivalent mined stone of the same cut, colour and clarity would be somewhere between AUD $4,000 and $7,000. That gap is real and it's structural — lab-grown has a shorter supply chain and isn't constrained by mining economics.

For some buyers, that's the entire conversation. For others, it isn't. I won't pretend the price difference is the whole story, because that would be patronising. But it's part of the story, and anyone who avoids saying so is being dishonest with you.

Why my family didn't make the same choice

Because they didn't have to. Their business is built on 25 years of mined-diamond expertise, long relationships, and a market that still values mined stones. They're not wrong, and I'm not right. We made different choices for different reasons in different places. I work with natural diamonds on demand for customers who specifically want them. But the default at ARKH is lab — because that's the direction I want to move, and because it's the one I can speak to most honestly.

What buyers actually ask me

"Will people be able to tell?"

No. Not by eye, not by hand, not by wear. The only way to distinguish a lab-grown from a mined diamond is with specialised equipment in a certification lab — and even then, the test confirms origin, not quality. The diamond doesn't behave differently. It doesn't fade. It doesn't dull. A century from now it will look exactly as it does today.

"Will it hold its value?"

This is the question I'm asked most often, and the most honest answer is: it depends on what you mean by value.

If you mean resale value — the price you could get if you sold the diamond five years from now — both lab-grown and mined diamonds lose value the moment you walk out the door. The diamond industry is structured around new sales; the secondary market for both categories is thin and pays significantly below retail. This is true for almost all jewellery, not just diamonds. If resale is your primary concern, you shouldn't be buying jewellery — you should be buying gold bars.

If you mean meaning, longevity, and durability — both will hold their value beautifully. A lab-grown diamond doesn't degrade. It's the same diamond, 50 years from now, that it is today. The gold or platinum it's set in is the only thing that will need any care.

"Is lab-grown a fad?"

Lab-grown diamonds were first produced commercially in the 1950s. They've been used in industrial applications (drill bits, cutting tools) for decades. The technology to grow gem-quality stones became viable around 2010, and the market has grown steadily since. They're not new and they're not going away. Whether they remain priced where they are today is a different question — supply is growing, which tends to reduce prices over time, and that's worth knowing if you're thinking about it as an investment. But as a piece of jewellery, lab-grown is now an established category, and a quarter of US engagement rings sold in 2023 had lab-grown centre stones. It is mainstream.

"What about certification?"

Every ARKH Radiance diamond over 1 carat ships with its original IGI certificate (or GIA on request — both are reputable international certification bodies). Stones under 1 carat ship with a Radiance card detailing the specifications. The certificate confirms cut, colour, clarity, carat, and origin (lab-grown or mined). It's a physical document; we pack it in the pocket of the Radiance box, sealed, with your piece. Don't accept a diamond — lab or mined — without certification from IGI or GIA. If a seller can't produce it, walk away.

How to actually choose

This isn't a decision you can outsource to a guide. But here's how I'd frame it, working backwards from what you want:

Choose lab-grown if

• The environmental question matters to you and you'd like a clear answer
• You want a larger or higher-quality stone within a given budget
• You're not buying it as a resale investment (almost no one should be)
• You like the idea of something cleanly made, contained, traceable end-to-end

Choose mined if

• The history matters to you — the billion-year story of the stone has emotional weight
• Your family has a tradition around heirloom mined diamonds and you want to continue it
• You've worked with a specific cutter or supplier you trust and want to keep that relationship
• You've thought about it honestly and that's what you want

Either choice is defensible. The worst decision is the one you made without thinking — accepting whatever the salesperson put in front of you, or buying lab-grown only because it was cheaper, or buying mined only because someone told you that was "the real thing." There's no real and not-real. There are two valid options, and the right one is the one you can explain to yourself.

What ARKH actually does

Radiance is our custom lab-grown diamond line. Every piece is designed in Melbourne and crafted at our family workshop in India — the same workshop that has worked with mined diamonds for 25 years. The craftsmanship is the same. The certification standards are the same. The stones are different.

We work with you to choose the cut (round, oval, cushion, pear, princess, heart, radiant), the carat, and the gold (9k, 14k, or 18k, hallmarked). We confirm pricing within 24 hours of your stone selection, take a refundable deposit, and produce the piece in four to six weeks. Every diamond over 1 carat ships with its original IGI certificate. Every piece is covered by our Lifetime Value Guarantee.

If you'd prefer a natural diamond, we can source one. It costs more, takes longer, and we'll be honest with you about the trade-offs. But it's available.

Where to start

The easiest way to begin is a free consultation. It's a 30-minute conversation — in person in Melbourne, or over WhatsApp/Zoom if you're anywhere else in Australia or beyond — where we walk through what you have in mind, show you stones at different price points, and answer questions like the ones above. No commitment. No pressure. If we're not the right fit you'll have a much clearer sense of what you want from someone else.

If you'd rather browse first, you can see our current Radiance pieces — rings, earrings, and necklaces — or book a consultation directly.

Either way, take your time. Diamonds are forever; the decision should feel that way too.