Handcrafted Ethical Fine Jewellery | Lucano

A diamond is one of the few things you'll buy that's expected to outlast you. It deserves to be chosen with the same rigour. This is the guide I'd give a friend who asked me, over coffee, how to actually buy a diamond in Australia — without the jargon, the upsell, or the vague "ethically sourced" line that almost no jeweller can back up.

I'm Simone, founder of Lucano. I trained as a gemmologist in Rome, spent two decades inside the global diamond supply chain — from Diamond wholesalers to Australia's largest handmade workshop (Cerrone), to Sarah & Sebastian, to Temple of the Sun — and I now make fine jewellery by hand in the Northern Rivers of NSW. I'm a member of the Università degli Orefici, the Noble College of Goldsmiths of Rome founded in 1508. None of that is decoration: it's the reason I can answer the questions most jewellers prefer you didn't ask.

This guide is built for Australian buyers. Prices are in AUD, certifications referenced are the ones that actually mean something here, and the sourcing standards discussed are the ones we follow at Lucano — not the marketing-friendly versions.

What a diamond actually is

A diamond is a single crystal of carbon, formed under enormous pressure either deep in the Earth's mantle (a natural diamond) or in a controlled chamber that recreates those conditions (a lab-grown diamond). Both are chemically and optically identical. The differences are in origin, price, and provenance — not in the stone itself.

What sets one diamond apart from another is how it interacts with light. That comes down to four measurable qualities — the 4Cs — plus a fifth quality that no certificate captures: the integrity of the supply chain behind it.

The 4Cs explained — properly

The 4Cs — Cut, Colour, Clarity and Carat — were codified by the GIA (Gemological Institute of America) in the 1940s and are still the global language for grading diamonds. Most guides list them. Few explain which ones actually change how the diamond looks on your hand.

1. Cut: the only C you should never compromise on

Cut is not the shape of the diamond. It's the geometry, symmetry and polish of its facets — the engineering that determines how light enters, bounces around inside, and returns to your eye. A well-cut diamond is alive. A poorly cut diamond is glass.

For round brilliant diamonds, the GIA grades cut on a five-tier scale:

If you take one thing from this guide: pay for the cut. A 0.9-carat Excellent-cut diamond will outshine a 1.2-carat Fair-cut diamond every day of the week. Cut is where the magic lives.

2. Colour: a scale from icy white to warm

Diamond colour is graded D through Z, where D is completely colourless and Z has a noticeable yellow or brown tint. The scale measures absence of colour, not presence of it.

Honest advice: in 18ct yellow gold, an H or I diamond looks beautifully white and saves you significant money over a D-F. In platinum or white gold, lean a step cooler — G or H — because the metal will make any warmth more visible.

3. Clarity: how to read the chart without overpaying

Clarity grades the internal characteristics (called inclusions) and surface features (blemishes) inside the diamond. The GIA scale runs from Flawless to Included.

The phrase to know is eye-clean — a diamond where the inclusions can't be seen without magnification. A well-chosen VS2 or SI1 stone is often eye-clean and costs a fraction of a VVS. This is where a gemmologist's eye saves you thousands.

4. Carat: weight, not size

A carat is a unit of weight, not size: one carat equals 0.2 grams. Two diamonds of identical carat weight can look very different on the hand because the cut determines how much of that weight is visible from above (called the spread).

There are also psychological price thresholds — 0.50ct, 0.70ct, 0.90ct, 1.00ct, 1.50ct, 2.00ct. Prices jump noticeably as you cross each one. A 0.95ct Excellent-cut diamond looks almost identical to a 1.00ct and can be 15–20% cheaper. We use this insight regularly when sourcing for Lucano clients.

Diamond certification: GIA, IGI, HRD and what to ignore

A diamond certificate (more accurately, a grading report) is an independent assessment of a stone's 4Cs by a gemmological laboratory. Not all labs are equal, and a certificate from a weak lab can be worse than no certificate at all because it creates false confidence.

In Australia, these are the laboratories worth trusting:

• GIA (Gemological Institute of America) — the global benchmark. Strictest grading, most consistent. The lab I recommend by default for natural diamonds.
• IGI (International Gemological Institute) — strong reputation for lab-grown diamond certification. The dominant lab in that segment.
• HRD Antwerp — Belgian, well respected in Europe; appears occasionally in Australia.
• AGS (American Gem Society) — now merged into GIA. Older AGS reports are still valid and rigorous.

Be cautious about diamonds graded "in-house" or by lesser-known regional labs. The same diamond graded by a lenient lab can come out one or two grades higher than it would at the GIA, which means you may pay a GIA-equivalent price for a stone that isn't.

Lab-grown vs natural diamonds: an honest comparison

Lab-grown diamonds are real diamonds. They are not "fake," not cubic zirconia, not moissanite. They are carbon crystals grown in a laboratory using either High Pressure High Temperature (HPHT) or Chemical Vapour Deposition (CVD) processes that replicate the conditions deep inside the Earth — in weeks rather than billions of years.

The differences that actually matter:

The honest position, after twenty years inside this industry: neither is "better." Natural diamonds carry the romance of geological time and a strong secondary market. Lab-grown diamonds offer a larger, higher-clarity stone for the same budget and a fully documented origin. The right choice depends on what you value — and I'll happily talk you through both for any piece I make.

What I won't do is pretend lab-grown is a worse diamond. It isn't. It's a different proposition with a different price.

Ethical diamonds in Australia: what "traceable" really means

"Ethically sourced" is the most-used and least-verified phrase in the Australian jewellery industry. After two decades watching it get printed on tags, websites, and brochures with no documentation behind it, I'd encourage every buyer to do one thing: ask for the paper.

A diamond is ethically sourced only if its origin can be documented and independently verified. The standards that actually mean something are:

• Kimberley Process certification — the baseline. It excludes conflict diamonds from the trade. Useful, but not sufficient on its own; it doesn't cover human rights or environmental performance.
• Responsible Jewellery Council (RJC) — the closest thing the jewellery industry has to a comprehensive ethics framework. RJC members are audited on labour, human rights, environmental impact, and chain-of-custody documentation. This is the standard we hold every Lucano supplier to.
• Chain-of-custody documentation — paperwork that tracks the stone from origin through every intermediary to the workshop. Without it, "ethical" is a marketing word.
• Origin-documented sources — Canadamark (Canadian), Argyle Pink Diamonds (Australian, the mine has closed but stones remain), Forevermark, and accredited lab-grown producers all provide verifiable origin.

At Lucano, every diamond we set carries chain-of-custody documentation. The metal that holds it is 18ct Australian gold from ABC Refinery — currently Australia's only independent refiner accredited simultaneously by the LBMA, the Shanghai Gold Exchange, and CME Group. The same rigour central banks apply to their gold, applied to your ring.

Not because it's marketable. Because I've stood in the mines and the workshops, and I know exactly where the industry cuts corners.

Diamond shapes and what they cost

Shape (sometimes confused with cut) refers to the outline of the diamond when viewed from above. Each shape has its own character, optical behaviour, and price profile.

Round brilliants command a premium because they waste the most rough diamond in cutting (over 50%) and demand the highest precision. Every other shape is, in effect, a way of buying more diamond for the same money — provided the cut is well executed.

Diamond prices in Australia: what to expect

Diamond pricing in Australia tracks global wholesale benchmarks (the Rapaport Price List for natural diamonds) plus currency conversion, GST, retailer margin, and setting costs. Indicative price ranges for round brilliant diamonds with G colour, VS clarity, Excellent cut, set in 18ct gold:

These are guideline ranges, not quotes — every diamond is individually priced based on its full grading report. As a working principle: prioritise cut, then choose colour and clarity that are eye-clean and look beautiful in your chosen metal, then size the carat to your budget. That's the order in which the diamond rewards you.

10 questions to ask any jeweller before you buy

The single best protection a diamond buyer has in Australia is specific questions. A jeweller who knows their craft will welcome these. A jeweller who doesn't will deflect.

1. Which laboratory issued the grading report — and can I see the original certificate?
2. What is the diamond's exact cut, colour, clarity and carat as shown on the report?
3. Is the stone eye-clean? Can I see it under 10x magnification?
4. What is the diamond's origin, and can you provide chain-of-custody documentation?
5. Is the stone natural or lab-grown — and is that disclosed on the certificate?
6. If the gold is described as "ethical," which refinery produced it and what accreditations does that refinery hold?
7. What is the metal alloy specifically — and in white gold, is it palladium-based or nickel-based?
8. Who actually makes the piece, and where is it set?
9. What is your policy on resizing, maintenance, and lifetime repair?
10. Will the diamond be set with security beading, micro-pavé, or claw — and which is best for my lifestyle?

If you can't get clear, confident answers to all ten, you have your answer about the jeweller.

Why people buy diamonds with Lucano

The jewellery industry runs on opacity. We don't. When you buy a diamond piece from Lucano, you get five things that genuinely can't be faked elsewhere in the Australian boutique segment:

• A working gemmologist chooses the stone — trained in Rome, in the trade since 2008.
• Twenty years of supply chain insider knowledge — the sourcing decisions are made by someone who has audited mines and refineries, not just bought from them.
• Chain-of-custody documentation on every diamond and every gram of gold — RJC standards, no exceptions.
• 18ct Australian gold from ABC Refinery — the only independent Australian refiner with simultaneous LBMA, SGE and CME Group accreditation.
• Handmade in the Northern Rivers studio, by the same person you're emailing.

We offer three ways to buy: a curated ready-to-wear collection, a build-your-own ring configurator, and a fully bespoke design service from concept to finished piece. Whichever path you take, the diamond is chosen the same way — with the eye of a gemmologist and the paperwork of a central bank.

Explore engagement rings Start a bespoke consultation Ask Sem a question

Frequently asked questions

What is the most important of the 4Cs?

Cut. A well-cut diamond returns more light to the eye and looks larger and livelier than a poorly cut stone of higher colour, clarity, or carat. If you have to compromise on one of the 4Cs, never compromise on cut.

Are lab-grown diamonds real diamonds?

Yes. Lab-grown diamonds are chemically, optically and physically identical to natural diamonds. The only differences are origin (laboratory rather than the Earth's mantle), age, and price. Both are graded by the same 4Cs and certified by the same laboratories.

How can I tell if a diamond is ethically sourced in Australia?

Ask for chain-of-custody documentation and check that the jeweller works with Responsible Jewellery Council (RJC) certified suppliers. Origin-documented programmes such as Canadamark and accredited lab-grown producers also provide verifiable provenance. If the jeweller cannot name the refinery, the lab, or produce the paperwork, the supply chain is not verified.

What is the difference between GIA and IGI certification?

GIA (Gemological Institute of America) is the global benchmark for natural diamond grading — strictest standards, most consistent results. IGI (International Gemological Institute) is the dominant laboratory for lab-grown diamond certification. Both are credible; GIA is generally preferred for natural diamonds, IGI is excellent for lab-grown.

How much should an engagement ring diamond cost in Australia?

There is no fixed rule. As of 2026, a one-carat round brilliant diamond of G colour, VS clarity and Excellent cut typically falls between AUD $8,000 and $14,000 for a natural stone and AUD $1,800 to $3,200 for a lab-grown stone, before the setting. Total ring prices at Lucano range from approximately AUD $2,000 for smaller stones to $20,000+ for bespoke designs.

Is yellow gold or white gold better for a diamond?

Neither is objectively better; it's a question of design and the diamond's colour grade. Yellow gold flatters slightly warmer diamonds (H–J colour) by harmonising with the warmth. White gold and platinum suit cooler stones (D–G) because any warmth will reflect against the metal. At Lucano, white gold is always palladium-based, never nickel-based, so it stays white without rhodium replating and won't trigger metal allergies.

Do you make custom engagement rings?

Yes. Bespoke design is a core part of what we do. The process typically takes 4–8 weeks from initial consultation to finished piece, and clients receive design sketches, CAD renders, and full sourcing documentation. Contact hello@lucano.com.au to begin.

Are all Lucano diamonds RJC-certified?

Every diamond Lucano sets comes from suppliers operating under Responsible Jewellery Council standards, with chain-of-custody documentation accompanying the stone. The same applies to the gold — sourced exclusively from ABC Refinery, Australia's only LBMA, SGE and CME Group accredited independent refiner.

A note from the bench

If you've made it this far, you're already shopping the right way: with questions, not assumptions. A diamond chosen carefully — for cut, for clarity to the eye, for provenance you can prove — will outlive any trend and most opinions. When the time comes, I'd be glad to help you choose one.

— Sem, founder & gemmologist, Lucano. Northern Rivers, NSW. hello@lucano.com.au