Tracr diamonds, diamonds on the blockchain explained

Tracr diamonds, diamonds on the blockchain explained

Every diamond has a journey before it reaches you. Until recently, almost none of them could prove it.

Tracr is the platform that puts natural diamonds on the blockchain, recording a stone's journey from the moment it leaves the ground, step by step. It was built by De Beers, opened to the wider industry in 2023, and in May 2026 GIA bought a 30 percent stake in it.

This guide explains what Tracr is, why the diamond industry needed diamonds on the blockchain at all, and what such a record can and cannot prove. To demonstrate the power of Tracr we also examine one real record end to end, using the GIA diamond, report 1478732293, that Carateu gave away in September, so none of this stays theoretical. You can open that record yourself and check every figure below against it.

1. The problem Tracr was built to solve

Every natural diamond undergoes a large transformation from the moment it is unearthed. It is recovered, sorted, sold as rough diamond, planned, cut, polished, graded, traded, and eventually sold to someone who may want to know where it came from.

Traditionally each of those handovers produced its own piece of paper, held by its own company. An origin claim reaching a buyer at the end was a chain of assertions, each one depending on the honesty of the last, and no link in it could be checked by the person being asked to believe it.

The Kimberley Process, established in 2003, addressed the worst of this by certifying that rough diamond shipments are not funding conflict. It works at the level of shipments and countries. It was never designed to follow one stone.

So the industry had a gap. It could say a parcel of rough diamonds came from a legitimate source. It could not say that this particular polished diamond, in your hand, came from that parcel.

2. What Tracr actually is

It is a digital platform that gives each registered diamond one identity and records what happens to it against that identity.

De Beers began developing it in 2018 and opened it to the wider industry in 2023, so the platform is not restricted to De Beers' own stones. More than five million rough diamonds have now been registered at source, which De Beers puts at roughly two thirds of its own rough production by value.

The blockchain is the part everyone talks about, and it does a specific job well. It makes every entry permanent, so nobody can quietly rewrite a diamond's history after the fact.

What it cannot do on its own is check that an entry was correct when it was written. That is the scanning's job, which is the next section and the reason the whole system holds together.

3. The scan is the point, not the blockchain

This is where the actual work happens, and it is the part worth understanding before anything else.

A diamond is scanned at the source, capturing its physical characteristics and creating its digital identity before it goes anywhere.

When it reaches a manufacturer, it is scanned again, and the second scan is matched against the first to confirm it is the same stone. Only then can the planning, cutting and polishing be added to its record. The polished stone is then received, recorded and transferred digitally down the chain.

That matching is what makes the record mean anything. A machine looks at a physical object and confirms it is the one registered at that source on that date. Strip the scanning out and you are left with a tamper-resistant database of unverified claims, which is not the same thing at all.

4. Reading one real record

Theory is easy. Here is an example of an actual record.

The diamond is GIA report 1478732293. You can open its Tracr record and look up its GIA report alongside what follows.

Source. The rough diamond was sourced through DTC, the Diamond Trading Company, which sorts and distributes De Beers Group's rough.

The record states that DTC sources diamonds in Botswana, Canada, Namibia and South Africa, that the stone is sourced in alignment with the OECD Due Diligence Guidance, and that it is fully compliant with the Kimberley Process.

It is worth reading that line carefully. It names the four countries the producer draws from, rather than one mine or one country for this particular stone.

That is a question of timing rather than a gap in the system. De Beers has made single country of origin available on Tracr for diamonds registered from January 2025 onwards. This stone was registered before that, so its record carries the producer's full footprint. A diamond registered today would name one country.

The rough diamond. It weighed 3.403 carats.

The split. Large rough diamonds are often divided rather than cut whole, because a cutter works around inclusions and crystal shape to reach the best result. This one was split, and one of the pieces weighed 0.669 carats.

Planning and cutting. The record describes the stage in plain terms. The planner checks progress against the original plan at each step, and the stone is released only when polish quality and cut parameters match what was planned.

The finished diamond. A 0.30 carat round brilliant, K colour, VS2, Excellent cut.

From 0.669 carats to 0.30 polished is a loss of just over 55 percent of the split. The rest of the original crystal went into other diamonds, so the split is the fair thing to measure against. None of that is waste. A cutter chooses between a heavier stone with worse proportions and a lighter one that handles light properly, and every angle is a decision about what to keep and what to give away. Our guide to hearts and arrows covers what happens at the far end of that precision.

5. How the record reaches the grading report

A record sitting on a platform is only useful if it reaches the person buying the diamond.

GIA and Tracr built a link between the two. Through what GIA calls the PROV-T Service, provenance information registered on Tracr can appear on eligible GIA grading reports, connecting the laboratory's assessment of the stone to the record of where it came from.

In May 2026 that relationship changed shape. GIA acquired a 30 percent shareholding in Tracr, announced on 29 May 2026. De Beers described it as a step in Tracr's evolution towards becoming an independent, industry wide platform rather than one company's tool.

Al Cook, CEO of De Beers Group, said consumers "deserve to know where their diamonds come from" and that "delivering provenance should become an industry standard".

Pritesh Patel, President and CEO of GIA, said that combining "source-based blockchain provenance with GIA's independent grading and identification expertise can help unlock a new level of transparency".

For a buyer, the significance is governance rather than technology. A provenance system owned entirely by the largest producer invites an obvious question about independence. One part owned by a non-profit grading institute answers some of it.

6. The report on the example diamond

The stone above carries a GIA Natural Diamond Dossier, dated 6 October 2023, report number 1478732293. It describes a round brilliant measuring 4.34 to 4.38 by 2.64 millimetres, 0.30 carat, K colour, VS2 clarity, with Excellent cut, polish and symmetry, medium blue fluorescence, and crystal and feather as its clarity characteristics. The report number is laser inscribed on the girdle, and the report can be looked up on GIA Report Check.

The Dossier format is worth explaining, because buyers often assume it is a lesser document. It is GIA's report format for natural diamonds between 0.15 and 1.99 carats. The grading results are produced to the same standards as a full report and it includes the laser inscription. What it leaves out is the plotted clarity diagram. The grading is not abbreviated, the illustration is.

If you want to know what every line on a report means, our guide to reading a diamond certificate goes through it field by field.

7. Why the industry needs this now

Traceability stopped being a nice story in April 2026 and became paperwork.

On 23 April 2026 the Council of the European Union adopted its twentieth package of sanctions relating to Russia. Among the measures, in the Council's own words, the traceability requirements for diamonds "have been tightened, obliging importers of polished diamonds to provide a due-diligence statement confirming that the diamonds were not mined, processed or produced in Russia".

That sits on top of existing rules requiring rough diamond imports to carry a Kimberley Process certificate naming the country or countries of mining origin, rather than a mixed origin certificate naming none.

So a diamond's origin is now a documentation question in Europe, not a marketing one. A stone with a record from source is simply easier to account for than one without, which is the practical reason a platform like Tracr matters to the trade rather than only to the story a retailer tells. Our page on ethical sourcing and compliance sets out how Carateu handles these obligations.

8. What the record shows, and what it does not

It records custody, and it names standards. The chain shows where a diamond came from and who handled it. The record also states which frameworks the producer works to, in this case the OECD Due Diligence Guidance and the Kimberley Process, which is more than most stones can show.

Putting provenance on chain is a real advance for the industry. It turns a chain of private assurances into something a buyer can open and read, and it holds every handler to a record they cannot quietly revise later. That is a meaningful gain in transparency.

What the record is not is an inspection of one mine or one polishing factory on one day. Naming a framework and auditing a site are different pieces of work, and the frameworks themselves do the second. So the record tells you whose standards apply, and lets you go and read them.

It covers registered diamonds only. Most diamonds on the market have no record, because they were recovered before these systems existed or came through producers that have not joined one. An absent record is not evidence of anything wrong.

It says nothing about beauty. A complete provenance record and a well cut stone are unrelated facts. A traceable diamond can be poorly cut, and a superbly cut diamond can have no record at all. The 4Cs still decide how the stone looks.

What our gemologist makes of it

Raiha Buchanan, gemologist and co-founder of Carateu, on whether she would steer a client towards a traceable stone.

Given the option, I would recommend a Tracr registered diamond to clients. They can trace the provenance of their stone with confidence, and follow how it evolved from rough to polished. It also gives confidence about the conditions it was sourced under. As a technologist, I like that it sits on the blockchain and provides immutable proof of the diamond. Overall, I really like it.

On that last point, the record names the frameworks the producer operates under, in this case the OECD Due Diligence Guidance and the Kimberley Process, and lets you read them yourself. That is a real improvement on being asked to take a seller's word for it.

Does every diamond have a record like this?

No. Traceability from source is still a minority of the market. It applies where a producer registered the stone at recovery and every subsequent handler maintained the chain. Plenty of beautiful, properly certified, entirely legitimate diamonds have no such record.

What a traceable stone offers is a specific, checkable answer to a question that is usually answered with reassurance.

If that is what you want, Carateu can source it. Traceable diamonds are found by request rather than sitting in a collection, so tell our concierge the shape, carat range and budget you have in mind and we will look for stones with a provenance record to match. You can also browse what is currently listed among our natural diamonds.

In summary

  • Tracr records a diamond's journey from recovery onwards, against one digital identity
  • De Beers built it, opened it to the industry in 2023, and GIA bought 30 percent of it in May 2026
  • The scan that matches rough to polished is what makes the record meaningful, not the blockchain itself
  • The example diamond went 3.403ct rough, to a 0.669ct split, to 0.30ct polished, losing more than half the split's weight
  • The record names four source countries for the producer, not one mine for the stone
  • Since April 2026, EU importers of polished diamonds must give a due-diligence statement on Russian origin
  • A record proves custody and origin and names the standards the producer works to, which is a real gain in transparency. It is not a site inspection, and it says nothing about how the diamond looks

A note on what to ask

Ask whether a diamond has a traceability record, and on which platform. Ask whether the provenance appears on the grading report or only in the seller's description. And ask what the record actually says, because country of origin and named mine are different claims.

The record tells you where the diamond has been. Looking at the diamond tells you the rest.

If you would like help reading a provenance record or comparing two stones, Carateu's concierge is happy to guide you.

Frequently asked questions

What is Tracr?

Tracr is a digital platform that records a natural diamond's journey from the point it is recovered, storing each step against one digital identity on a blockchain. It was developed by De Beers from 2018, opened to the wider diamond industry in 2023, and GIA acquired a 30 percent shareholding in it in May 2026. More than five million rough diamonds have been registered on it at source.

What does it mean for a diamond to be on the blockchain?

It means each handover in the diamond's life has been recorded against one identity in a ledger that is very difficult to alter afterwards. The blockchain protects the entries. What makes them trustworthy is that the stone is rescanned at handovers and matched against its original scan, so the record follows a physical object rather than a claim.

What does a Tracr record tell you about how a diamond was sourced?

It shows the diamond was registered at the point it was recovered and follows it through every handover, so the chain of custody is documented rather than asserted. The record in this guide also states that the producer sources in alignment with the OECD Due Diligence Guidance and is fully compliant with the Kimberley Process, and it names the countries that producer draws from. That is considerably more than most diamonds can show. Those frameworks, rather than the record itself, are what inspect individual sites.

Can a diamond be traced back to the mine it came from?

It can be traced to a producer, and increasingly to a single country. De Beers has made single country of origin available on Tracr since January 2025 and registers all newly sourced rough diamonds of one carat and above. A record created before that names the producer's source countries rather than one mine.

How much of a rough diamond is lost when it is cut?

It varies with the shape and internal character of the rough diamond. In the example in this guide, more than 55 percent of the split's weight was removed to produce the finished stone. The rest of the original crystal went into other diamonds, so the split is the fair comparison rather than the whole crystal.

Can I buy a diamond with a Tracr record from Carateu?

Yes. Traceable diamonds are sourced by request rather than held in a standing collection, so the process starts with a conversation about shape, carat range and budget. Carateu's concierge will look for stones with a provenance record that match, and every diamond is reviewed by our gemologist in Stockholm before it ships.

Does Carateu work with Tracr or De Beers?

No. Carateu has no partnership, affiliation or commercial relationship with Tracr, De Beers or GIA. Carateu sells diamonds those organisations have graded or recorded, which is a different thing.

Sources

Every passage in quotation marks above is GIA's, Tracr's or the Council's own wording, linked at the point it appears. The pages in full.

Last verified 29 September 2026. Photography and stills by Carateu. Diamond imagery and record via Tracr. Carateu is not affiliated with Tracr, De Beers or GIA.