What Is an IGI Lab-Grown Diamond Certificate?

When a retailer describes a diamond as IGI certified, the useful question is: What exactly did IGI examine and what report was issued?

For an individually reported loose lab-grown diamond, IGI can identify its laboratory-grown origin and record relevant gemmological characteristics.

For a finished jewellery article, IGI can examine the mounted gemstones and provide information about the complete piece within the limitations created by the mounting.

The presence of an IGI report therefore provides independent laboratory information. It does not mean every IGI-reported diamond has the same quality, price or appearance.

IGI stands for the International Gemological Institute. It provides independent laboratory services for diamonds, laboratory-grown diamonds, coloured gemstones and finished jewellery.

IGI has been reporting laboratory-grown diamonds for many years and currently provides dedicated Laboratory Grown Diamond Reports as well as reporting for finished laboratory-grown diamond jewellery.

For a consumer, IGI's main relevance is straightforward: the laboratory examines the submitted gemstone or jewellery item independently of the retailer selling it.

This creates a third-party record that can be compared with the seller's product information.

"IGI certificate" is extremely common consumer language, which is why people search for it. IGI itself uses both certification language in consumer-facing material and the more specific term Laboratory Grown Diamond Report for the actual document.

For precision, Aurelia should generally refer to the physical document as an IGI report. The phrase "IGI-certified lab-grown diamond" can still appear naturally where useful for search intent, but the article should explain that the document itself is a laboratory report describing the submitted stone.

This avoids implying that certification functions like a warranty or approval badge.

One of the report's most important functions is establishing the nature of the submitted gemstone. IGI states that it screens diamonds using specialist technologies to distinguish among: naturally mined diamonds, laboratory-grown diamonds and diamond simulants.

For a laboratory-grown stone, the resulting report identifies it accordingly. That is important because natural and laboratory-grown diamonds can be extremely difficult to distinguish reliably by ordinary visual inspection.

The report therefore provides more meaningful evidence of origin than simply relying on appearance or a basic handheld diamond tester.

For the full identification question, see Can You Tell a Lab-Grown Diamond from a Natural Diamond?

For an individual loose laboratory-grown diamond, IGI states that its report can include the diamond's description, shape, cutting style, measurements and 4Cs assessment.

Depending on the stone and report, additional information can include polish, symmetry, fluorescence, proportions, clarity characteristics and other relevant grading information.

IGI also states that, upon request, the growth process and presence of treatments can be noted in the comments section.

That means an IGI document can potentially tell a buyer considerably more than simply: "This is a lab-grown diamond." It can help describe which individual diamond is being examined and what characteristics the laboratory observed.

For a field-by-field explanation, use Aurelia Royale's How to Read a Lab-Grown Diamond Certificate guide.

IGI continues to assess laboratory-grown diamonds using the familiar 4Cs framework: Carat Weight describes the diamond's weight. Colour evaluates relevant colour characteristics. Clarity evaluates internal inclusions and external blemishes. Cut, where applicable to the diamond and reporting system, evaluates aspects of how the polished stone has been fashioned.

These grades should be read together rather than treated as four numbers to maximise independently. A higher grade in one category does not automatically make one diamond the best choice.

Dimensions, proportions, shape and visible appearance still matter.

Yes, individual loose-diamond reports can include measurements in millimetres. This information is especially useful because carat measures weight rather than physical face-up size.

Two diamonds can have the same carat weight and different visible dimensions. For example, two one-carat stones can distribute their weight differently depending on shape and proportions.

This is why buyers should read measurements alongside carat rather than relying only on the headline weight.

For that subject, see Diamond Carat Weight vs Size.

It can. IGI states that the growth process used and the presence of treatments can be noted in the comments section upon request.

A laboratory-grown diamond may have been created through either: Chemical Vapour Deposition — CVD or: High Pressure High Temperature — HPHT.

A CVD-grown stone may also have received HPHT treatment after growth. That does not make it HPHT-grown. Growth method and post-growth treatment are separate pieces of information.

For the complete explanation, see CVD vs HPHT Lab-Grown Diamonds.

Where applicable, IGI documentation may indicate that there was no indication of post-growth treatment. This may be described using "as grown" terminology.

It does not mean the diamond came directly from a reactor and was never processed. The rough still had to be cut and polished.

"As grown" in this context relates to the absence of detected post-growth treatment intended to alter characteristics after the crystal-growth stage. It is manufacturing-history information rather than a separate quality grade.

No. A buyer should not assume that "as grown" means more beautiful, more durable or automatically more valuable.

A post-growth-treated CVD diamond can have excellent visual characteristics. An as-grown diamond can also be excellent.

The treatment information simply helps describe how the diamond reached its present state. The finished stone still needs to be judged on its individual characteristics.

IGI says information regarding detected treatments can be included in report comments. That matters because laboratory-grown diamond production can involve processing after initial crystal growth.

Treatment disclosure allows the buyer to understand that manufacturing history rather than being left to guess.

The comments section should therefore not be ignored simply because the headline 4Cs appear attractive.

Each IGI report has an identifying report number. That number links the document to IGI's laboratory record.

It is one of the most important pieces of information on the document because it allows the buyer to check whether the report details stored by IGI correspond with the document they have been shown.

This article will not reproduce the full verification process because Aurelia already has a dedicated guide for that intent.

Use How to Verify an IGI Diamond Report Online for the step-by-step verification workflow.

Consumers frequently call the report number a "serial number", but those terms should be distinguished. The report number identifies IGI's laboratory record.

Where the diamond also carries a matching laser inscription, that identifying number may be microscopically inscribed on its girdle. This creates a connection between the physical diamond and the corresponding laboratory report.

But the report number exists as part of the laboratory documentation even when discussing the document itself.

For inscriptions specifically, see What Is a Diamond Laser Inscription?

IGI offers its LaserScribe service, which can place the report number on a diamond's girdle and link the stone with its laboratory documentation.

However, Aurelia should avoid turning that into a blanket statement that every IGI-reported lab-grown diamond everywhere must always have a visible inscription. Service type, stone, report and submission circumstances can matter.

Where an inscription is present, it can provide a useful additional identifying feature. The correct approach is to read the actual report for the diamond being considered.

A report-linked girdle inscription is microscopic. Its purpose is identification rather than decoration.

It is intended to be read under magnification rather than to form a visible part of the diamond's face-up appearance.

A shopper should therefore not expect to see a large number or logo simply by looking at jewellery normally.

This distinction needs to be explicit because the two documents do not provide identical information.

Neither document is automatically "better". They answer different questions.

A loose stone can be accessed from every direction. It can be weighed independently. The girdle can be examined without prongs covering sections of it. The colour and clarity can be evaluated without the surrounding jewellery interfering as much with the view.

Once a diamond is mounted, metal can cover parts of the gemstone. A prong may sit over a clarity characteristic. A bezel may conceal much of the girdle. The mounting can also prevent direct weighing of the individual stone.

This is why mounted-jewellery reporting and individual loose-diamond reporting should not be presented as identical laboratory procedures.

IGI offers reporting for finished jewellery containing laboratory-grown diamonds. According to IGI, the finished-jewellery report can describe the article, identify mounted gemstones and record precious-metal content and purity stamps where present.

For centre stones, shape, cutting style, measurements and 4Cs assessments can be supplied as the mounting permits.

Those four words are important. Mounted reporting provides valuable information, but the setting can physically restrict what can be observed.

Therefore, a jewellery report should not be misrepresented as though every mounted stone had necessarily undergone exactly the same examination as a loose diamond.

Imagine a solitaire ring with one significant laboratory-grown centre diamond. That centre stone may have been submitted to IGI while loose and received its own individual report before setting. The report would relate to the centre diamond.

Once mounted, the finished ring contains additional components: the setting, precious metal, prongs, band and possibly other design details. The loose-diamond report does not automatically become a laboratory report for all of those components.

This is why product pages should be precise when saying a ring is "IGI certified". A clearer description could explain that the centre diamond is accompanied by an IGI Laboratory Grown Diamond Report, where that is factually true for that SKU.

Now consider a bracelet containing 50 small laboratory-grown diamonds. Separate full reports for every small stone would often be impractical.

A finished-jewellery report can instead document the bracelet as a complete article and identify the mounted gemstone type and relevant jewellery information.

This is a very different reporting use case from a loose solitaire. The difference does not indicate weaker verification. It reflects what the laboratory has been asked to examine.

A pair of solitaire studs containing two substantial diamonds could potentially have an individual report for each main stone. A pavé earring containing many tiny diamonds might instead be documented differently.

Again, the phrase "IGI certified earrings" by itself is not enough. Ask whether IGI examined: the two principal diamonds individually; the completed earrings; or another submitted configuration.

Understanding the scope of the report is more useful than simply seeing the IGI name.

An IGI Laboratory Grown Diamond Report identifies the submitted stone as laboratory-grown diamond following gemmological examination. That is different from cubic zirconia or moissanite.

IGI says its screening process distinguishes naturally mined diamonds, laboratory-grown diamonds and simulants. So the report provides independent evidence regarding the identity and origin classification of the examined stone.

However, buyers should still ensure that the physical diamond being sold corresponds to the report being presented. Report verification and stone matching are related but separate steps.

No. This is an important misconception. IGI reports both naturally mined and laboratory-grown diamonds. Seeing an IGI logo therefore does not tell you the stone's origin by itself.

Read the report's description. If it says Laboratory Grown Diamond, that is how IGI classified the submitted stone.

Never assume: IGI report = natural diamond.

Not automatically. A laboratory report can describe a diamond with outstanding characteristics. It can also document a diamond with more modest characteristics.

Reporting does not mean IGI has declared: "This is the perfect diamond for everyone." It means the laboratory has examined the submitted stone and recorded its findings according to the applicable reporting system.

The buyer must still decide whether those characteristics, dimensions and appearance suit the jewellery and budget.

No. Laboratory-grown diamonds can contain inclusions and blemishes. One important purpose of clarity grading is to describe those characteristics.

A VS2 lab-grown diamond with an IGI report has not somehow failed certification because it is not internally flawless. Its report simply records the clarity assessment.

For detailed interpretation, use Lab-Grown Diamond Clarity Grades Explained.

No. A report can provide cut and finish information where applicable, but the presence of an IGI document does not itself create brilliance.

Sparkle depends on the finished diamond's faceting, proportions, cleanliness, lighting and other visual characteristics. Two IGI-reported stones can look different.

For sparkle specifically, read Do Lab-Grown Diamonds Lose Their Sparkle?

An individual diamond report does not. This distinction matters enormously for rings, necklaces, bracelets and earrings.

A laboratory report for a centre diamond does not automatically evaluate: prong construction, clasp security, chain quality, comfort, ring sizing or overall workmanship.

The diamond and the finished jewellery are related but separate quality questions. A finished-jewellery report has a different scope, but it still should not be presented as a universal lifetime workmanship guarantee.

For finished-piece evaluation, see What Makes Lab-Grown Diamond Jewellery High Quality?

No. IGI explicitly explains that certification/reporting provides objective information about diamond characteristics but is not itself an appraisal.

That means an IGI report should not be read as: "This diamond is worth £5,000." Nor does the presence of the report guarantee what someone will pay for the stone in the future.

Financial valuation is a separate service and purpose.

For resale specifically, use Do Lab-Grown Diamonds Have Resale Value?

No. It can make the diamond easier to identify and describe because a future buyer has independent gemmological information. That can be useful.

But resale still depends on the current secondary market, the stone, jewellery condition, current prices and the buyer. A report documents the diamond. It does not promise its future price.

A laboratory report should not be described as a lifetime product warranty. The report records findings made when the item was examined under the applicable laboratory process.

That is very different from a retailer promising repair, replacement or future financial value. Aurelia should therefore avoid phrases such as: "IGI lifetime guarantee" unless there is a separate, verified service with explicit written terms.

An IGI report can provide useful identifying information about a diamond, but it is not automatically an insurance appraisal.

An insurer may request separate valuation information to establish replacement coverage. The grading report and insurance valuation should therefore not be treated as interchangeable documents.

No. IGI reports naturally mined diamonds, laboratory-grown diamonds, coloured gemstones and finished jewellery. Its involvement with laboratory-grown diamonds is significant, but the IGI name itself does not identify diamond origin.

Again, read the actual report description.

An individual report is especially useful where one diamond represents a significant part of the purchase. That could include a prominent solitaire centre diamond, a substantial loose diamond purchased for a custom ring, or two significant stones used in a pair of stud earrings.

In those situations, stone-specific measurements and quality information are particularly relevant. For very small accent stones, other documentation approaches can be more practical.

For the full decision framework, read Do Lab-Grown Diamonds Need Certification?

This page should not turn into a broad laboratory competition. IGI and GIA currently use different approaches for laboratory-grown diamond reporting.

IGI continues to provide detailed reports including 4Cs information. GIA's current principal assessment for eligible colourless-to-near-colourless laboratory-grown diamonds uses its distinct Premium and Standard classification.

That means a consumer should understand the document actually being offered rather than assuming the two systems are identical. A report from either laboratory should be interpreted using that laboratory's current terminology and criteria.

Suppose an IGI report describes a diamond as: F colour, VS1 clarity. That should not be rewritten as though GIA had independently assigned those same grades.

Likewise, a current GIA Premium Quality Assessment should not be converted by a retailer into a fabricated detailed IGI-style grade. Laboratories issue their own findings. Retailers should reproduce them accurately rather than translating one laboratory's report into another laboratory's terminology.

Yes, laboratory report designs and services can evolve. Different markets, stone types, dates and report services can also use different formats.

That means an older legitimate report may not look exactly like an example currently shown on IGI's website. The better way to assess a document is not: "Does this PDF look exactly like today's sample?"

Instead determine what report type it is and use IGI's official verification system where appropriate.

The complete verification workflow belongs to How to Verify an IGI Diamond Report Online.

The logo alone is not enough. If a seller claims a particular diamond has an IGI report, there should be enough information to connect the diamond being offered with the relevant laboratory document.

The report number, diamond characteristics and available inscription information can all contribute to that connection.

Do not substitute a generic "IGI Certified" badge for actual product-level documentation.

Aurelia should only make an IGI claim where it has been confirmed for the specific product or centre diamond.

For example, where factually verified, product copy could state that: The centre laboratory-grown diamond is accompanied by an IGI Laboratory Grown Diamond Report.

That is much stronger than a generic site-wide statement such as: All Aurelia diamonds are IGI certified. unless the client has explicitly confirmed that the statement applies across every relevant product.

This page must not create a catalogue-wide promise that operations cannot support.

Then say that. Do not call a finished-jewellery report an individual loose-diamond grading report if that is not what was issued.

For example, product copy can distinguish between: IGI report for the centre diamond and: IGI finished-jewellery report depending on what actually accompanies the product.

The difference increases transparency rather than weakening the product.

An IGI report can provide independent gemmological information about the submitted diamond or jewellery article. It can help establish diamond origin. It can describe relevant quality characteristics. It can provide a report number connecting the document with an IGI laboratory record. And, depending on the service, it can provide growth-method and treatment information.

But it does not automatically tell you: whether the retail price is good; whether the finished jewellery is comfortable; whether its clasp will last forever; how much the diamond will resell for; or whether a particular design is right for you.

Use the report as evidence, not as a substitute for evaluating the complete purchase.

An IGI Laboratory Grown Diamond Report is an independent gemmological record of the diamond submitted to IGI for examination.

For an individual loose laboratory-grown diamond, it can establish laboratory-grown origin and document characteristics including shape, measurements and 4Cs assessment. Growth process and treatment information may also be included in the comments according to the report service and request.

For completed jewellery, IGI offers a different reporting approach. A finished-jewellery report can describe the article, identify mounted gemstones and record precious-metal information, while centre-stone characteristics are assessed as the mounting permits.

That means "IGI certified" should never be the end of your investigation. Ask: What type of IGI report is it? What exactly did IGI examine? Does the document cover the centre diamond or the complete jewellery article? What information does the report actually contain?

And then verify the corresponding report through IGI's official system.

Most importantly, remember what the report does not prove. An IGI report is not a guaranteed resale price. It is not an insurance appraisal. It is not a lifetime jewellery warranty. And an individual centre-diamond report is not automatically an assessment of the entire ring, necklace, bracelet or pair of earrings.

It is independent gemmological information designed to help you understand what you are buying.

For a field-by-field explanation, continue with How to Read a Lab-Grown Diamond Certificate.

For whether every stone needs individual documentation, read Do Lab-Grown Diamonds Need Certification?

For loose-diamond versus finished-jewellery reporting, use Diamond Certification vs Jewellery Certification.

For the report-check process, continue with How to Verify an IGI Diamond Report Online.

And for report-linked girdle markings, use What Is a Diamond Laser Inscription?

When reviewing an Aurelia Royale product, rely on the documentation specified for the individual piece or centre stone rather than assuming every product uses the same laboratory report.

Where a design is not currently available for direct purchase, Join the Waitlist or submit an enquiry to register your interest.