Introduction
Transparency in the diamond industry is not a single thing. It is a layered system — part regulation, part industry standard, part emerging technology — that determines what you are told about the diamond you are buying, and how much of that information you can verify.
Some disclosure is required by law. Some is expected by industry practice. Some is made possible by technologies that did not exist a decade ago. Understanding which is which gives you the vocabulary to evaluate any seller's claims — and to know when a reassuring label is backed by substance.
What the Law Requires
Lab-Grown Diamond Disclosure
In the United States, the Federal Trade Commission's Jewelry Guides establish the baseline. The core requirement is unambiguous: lab-grown diamonds must be clearly and conspicuously identified as such at every stage of the sales process. The word "diamond" used alone, without qualification, refers to a natural stone. A lab-grown diamond must be described using approved terminology — "laboratory-grown," "laboratory-created," or a manufacturer-specific equivalent — in close proximity to wherever the word "diamond" appears in advertising or sales materials.
The FTC has sharpened its enforcement in recent years. In 2019, the Commission sent warning letters to several lab-grown diamond companies for making unqualified environmental claims. The message was clear: marketing a diamond as "eco-friendly" or "sustainable" without substantiation is a deceptive practice, regardless of origin.
These guidelines are US-specific. For Arete Diamond's primary Czech audience, the applicable framework is EU consumer protection law, which similarly prohibits misleading commercial practices but operates under different regulatory specifics. The principle is consistent across jurisdictions: the buyer has the right to know whether their diamond formed in the Earth or in a reactor.
Treatment Disclosure
Any process that alters a diamond from its natural state must be disclosed to the buyer. This is both a regulatory requirement and a professional standard upheld by every reputable grading laboratory.
The most common treatments include:
- Laser drilling — a laser burns a narrow channel to reach a dark inclusion, which is then dissolved with acid to improve apparent clarity
- Fracture filling — a glass-like substance is injected into surface-reaching fractures to reduce their visibility
- HPHT treatment — high pressure and high temperature applied after mining to improve colour, typically converting brown diamonds to colourless or near-colourless
- Irradiation — controlled exposure to radiation to produce or intensify fancy colours, often followed by annealing to stabilise the result
- Coating — a thin surface layer applied to alter a diamond's apparent colour
GIA, AGS, and other reputable laboratories note every detected treatment on their grading reports. A diamond graded by GIA that has been laser drilled will carry that notation. A fracture-filled diamond will be identified. This is non-negotiable at the laboratory level.
The gap in the system is not at the laboratory. It is at the point of sale. A diamond sold without a grading report — or with a report from a laboratory that does not rigorously test for treatments — may carry undisclosed enhancements. This is why the grading report, and the reputation of the laboratory that issued it, matters for treatment transparency as much as it does for quality assessment.
How Grading Bodies Support Transparency
GIA's approach to disclosure is systematic. Every diamond submitted for grading is tested for treatments as part of the standard evaluation process. The report states clearly whether treatments were detected, and if so, which ones. This information appears on the report itself, not in supplementary documentation that might be separated from the stone.
GIA also offers a Report Check service — any consumer can verify a GIA report online by entering its number, confirming that the report is genuine and that the stone's recorded characteristics match. This is a simple but powerful transparency tool: it means a grading report cannot be fabricated or altered without detection.
For lab-grown diamonds, GIA issues separate reports with distinct formatting, making it immediately clear whether a stone is natural or laboratory-grown. The reports for lab-grown diamonds include the growth method (HPHT or CVD) and note any post-growth treatments detected.
The Blockchain Revolution in Diamond Provenance
The most significant development in diamond transparency over the past decade is the application of blockchain technology to supply chain tracking. Several platforms are now operational at commercial scale.
De Beers Tracr
Tracr is the diamond industry's largest blockchain provenance platform. Launched by De Beers, it creates a digital identity for each diamond at the point of production — recording its origin, physical characteristics, and chain of custody as it moves from mine through cutting, polishing, and retail.
The numbers are meaningful. Nearly 3 million individual diamonds have been registered on the platform since its commercial deployment. All De Beers Group-sourced rough diamonds over one carat now receive country-of-origin information through Tracr. Leading producers including the Okavango Diamond Company and Mountain Province Diamonds have joined the platform.
In 2025, De Beers expanded the consumer-facing side of this infrastructure with ORIGIN — a programme launched in North America that provides buyers with detailed journey information for individual diamonds, from mine to store.
Everledger
Founded in 2015, Everledger takes a different approach — creating what it calls a "digital twin" for each diamond, recording over 40 unique data points across colour, clarity, cut, provenance, and ownership history. The platform uses a combination of blockchain, AI, and IoT technology to build tamper-resistant records.
Everledger's architecture includes privacy tiers — supply chain participants can share selected data while keeping commercially sensitive information private. The platform has been adopted by retailers including Chow Tai Fook and Brilliant Earth, and collaborates with GIA to integrate grading reports.
What Blockchain Can and Cannot Do
Blockchain technology solves a specific problem elegantly: it creates immutable records. Once data is entered, it cannot be altered or deleted. This makes the chain of custody verifiable in a way that paper documentation never could be.
But blockchain does not solve every problem. The technology secures the digital record — it does not independently verify the accuracy of the data entered at each stage. If the first entry in the chain is inaccurate — if a diamond is incorrectly attributed to a particular mine at the point of entry — the blockchain will faithfully preserve that inaccuracy forever.
This is not a reason to dismiss blockchain provenance. It is a reason to understand it accurately. The platforms are a genuine advance in supply chain transparency. They are not a substitute for the integrity of the people and processes at each link in the chain.
What You Should Expect Your Jeweller to Disclose
A responsible retailer should be prepared to tell you:
- Whether the diamond is natural or lab-grown. This is a legal requirement, not a courtesy.
- Any treatments or enhancements. If a diamond has been laser drilled, fracture filled, HPHT treated, or colour enhanced, you have the right to know before purchase.
- The grading report. Which laboratory issued it, what report number it carries, and how you can verify it independently.
- Country of origin, if known. Increasingly available through platforms like Tracr and GIA's Origin Report service — though not yet standard for all diamonds.
- Sourcing standards. Whether the retailer sources through Kimberley Process-certified channels, works with RJC-certified suppliers, and maintains documented chains of custody.
The quality of the answers tells you as much as the answers themselves. A jeweller who welcomes detailed questions about sourcing and disclosure is demonstrating the transparency that matters. One who deflects or offers only vague assurances — "all our diamonds are ethically sourced" without specifics — is not providing the transparency you deserve.
Transparency at Arete Diamond
We believe transparency is not a marketing position. It is an operational commitment.
Every natural diamond above 0.30 ct in our collection is accompanied by a grading report from GIA, HRD Antwerp, or IGI. Melee diamonds — the small accent stones set into our jewellery — are graded by Arete Diamond's own gemologists and accompanied by an Arete quality guarantee. We source through Kimberley Process-certified channels and work with suppliers who meet independently audited ethical standards. We maintain documented chains of custody for our stones.
Our lab-grown diamonds are accompanied by IGI grading reports that document the growth method, quality grades, and any post-growth treatments. Origin type — whether a diamond is natural or laboratory-grown — is stated clearly and prominently on every product page. We hold both categories to the same standard of disclosure.
Where we can provide country-of-origin information, we do. Where we cannot — as is the case for some melee stones and accent diamonds — we say so honestly, rather than making claims we cannot substantiate. We are committed to adopting provenance technologies as they mature and become reliable at scale.
If you have questions about the sourcing, treatment status, or provenance of any diamond in our collection, we welcome them. Transparency works best as a conversation, not a label.
Summary
Diamond transparency operates on three distinct levels: legal requirements that mandate disclosure of lab-grown status and treatments, grading body practices that document this information on every report, and emerging blockchain platforms that are making mine-to-market traceability increasingly practical. Buyers should expect their jeweller to disclose natural-or-lab-grown status, any treatments, the grading report details, and sourcing standards — and should evaluate sellers by the specificity and honesty of their answers, not by the warmth of their reassurances.
Frequently Asked Questions
What must a jeweller legally disclose about a diamond?
In the US, FTC Jewelry Guides require that lab-grown diamonds be clearly identified as such, and that any treatments or enhancements be disclosed before sale. EU consumer protection law imposes similar obligations against misleading commercial practices. Beyond legal requirements, industry standards set by GIA and AGS mandate that all detected treatments appear on the grading report.
How can I verify a diamond's grading report?
GIA offers a free online Report Check service where you can enter any GIA report number and confirm the stone's recorded characteristics. This allows you to verify that a report is genuine and has not been altered. Other reputable laboratories offer similar verification tools.
What is blockchain diamond tracking?
Blockchain tracking creates an immutable digital record of a diamond's journey from mine to retail. Platforms like De Beers' Tracr and Everledger register individual diamonds at the point of production and record each handoff through the supply chain. The technology makes chain-of-custody records tamper-proof, though it relies on accurate data being entered at each stage.
Are "conflict-free" claims trustworthy?
A claim of "conflict-free" should be backed by verifiable evidence — specifically, sourcing through Kimberley Process-certified channels and, ideally, adherence to broader standards like the Responsible Jewellery Council Code of Practices. If a seller cannot explain the specific frameworks and certifications behind their conflict-free claim, the assurance is not meaningful.
Does "ethically sourced" have a standard definition?
No. Unlike "conflict-free" (which has a specific UN and KPCS definition), "ethically sourced" has no universally agreed standard. It can mean anything from basic Kimberley Process compliance to full mine-to-market traceability with independently audited environmental and labour standards. Always ask what specific certifications, frameworks, and supply chain practices support the claim.
Related Reading
- What "Responsible Sourcing" Means — the frameworks governing ethical diamond supply chains
- Traceability vs Origin Determination — two different approaches to proving where a diamond comes from
- Conflict Diamonds & the Kimberley Process — the history and mechanism behind conflict-free certification