Why Diamond Certification
Why Diamond Certification Matters
A reputable jewellery brand should be able to tell you clearly what is in the piece you are buying — the diamond origin, its quality, the metal purity, and how it has been documented. A certificate or jewellery report is the formal record that supports those claims. Without certification, you are relying entirely on the jeweller's word. With it, you have an independent third-party record you can verify.
For lab-grown diamond jewellery, certification also confirms that the diamonds are indeed lab-grown and not natural mined diamonds substituted without disclosure — or, conversely, that a natural diamond has not been accidentally labelled as lab-grown.
a Diamond Certificate?
What Is a Diamond Certificate?
A diamond certificate — also called a grading report — is issued by a gemological laboratory. It documents the characteristics of a loose diamond: its weight in carats, cut quality, colour grade, clarity grade, and confirmation of its origin (natural or lab-grown). The certificate is typically issued before the diamond is set into jewellery.
Well-known names in diamond grading include IGI (International Gemological Institute), SGL (Solitaire Gemmological Laboratories), and GIA (Gemological Institute of America). Each has its own grading methodology and report format.
What Is a Jewellery Report?
What Is a Jewellery Report?
A jewellery report is different from a loose diamond certificate. It is issued after the diamond has been set into a piece of jewellery. A jewellery report typically covers the complete piece: the total diamond weight (not individual stone details), the metal type and purity, gross jewellery weight, and diamond origin where the lab can confirm it.
For smaller jewellery pieces — stud earrings, daily wear rings, pendants — it is very common to receive a jewellery report rather than individual loose diamond certificates for each stone. This is normal and acceptable, but you should know what kind of document you are receiving and what it covers.
IGI Certificate: What
IGI Certificate: What Buyers Should Know
IGI (International Gemological Institute) is one of the most widely used grading laboratories globally and has significant presence in India. IGI grading reports are commonly issued for both natural and lab-grown diamonds. For lab-grown diamonds, an IGI certificate will clearly state the diamond's origin as "laboratory grown." The report covers carat weight, colour, clarity, cut, and a unique report number that can be verified online.
IGI certification is widely accepted in the Indian jewellery market and is a reliable indicator that the diamond has been independently evaluated.
SGL Certificate: What
SGL Certificate: What Buyers Should Know
SGL (Solitaire Gemmological Laboratories) is an Indian gemological laboratory that issues both loose diamond grading reports and jewellery reports. SGL is particularly known for jewellery reports that cover the full piece — including total diamond weight, metal details, and jewellery gross weight. Many Indian jewellery brands, including those offering lab-grown diamonds, use SGL jewellery reports as the standard documentation for their pieces.
SGL reports often include a QR code that can be scanned for online verification. This is a practical feature that makes it easy for buyers to confirm the document's authenticity quickly.
GIA Certificate: What
GIA Certificate: What Buyers Should Know
GIA (Gemological Institute of America) is one of the most recognised names in global diamond grading, and developed the 4Cs system the industry still uses for natural diamonds. Since October 2025, GIA no longer assigns individual colour and clarity grades to lab-grown diamonds — instead, lab-grown stones submitted to GIA receive a simplified ‘Premium’ or ‘Standard’ quality assessment, without the detailed D-to-Z colour or FL-to-I3 clarity breakdown used for natural stones.
This means a GIA report for a lab-grown diamond today carries less granular detail than an IGI or SGL report for the same stone — both of which still grade lab-grown diamonds on the full 4Cs. For lab-grown jewellery specifically, IGI and SGL certificates currently offer more detailed documentation than GIA’s newer format.
Loose Diamond Certificate
Loose Diamond Certificate vs Jewellery Report
Understanding the difference between these two is important when you review your documentation.
A loose diamond certificate covers one specific diamond before it is set. It gives you detailed individual grading: the exact carat weight of that stone, its colour grade, clarity grade, cut grade, and origin. This level of detail is typically available for larger centre diamonds in rings or solitaire designs.
A jewellery report covers the finished piece. It tells you the total diamond weight across all stones in the piece, the metal purity, the gross jewellery weight, and typically the diamond origin. Individual grading of each small stone is not always part of a jewellery report. This is standard practice for multi-stone jewellery — earrings, bracelets, and rings with multiple accent diamonds.
Neither is inherently better or worse — they serve different purposes. What matters is that your piece comes with some form of credible certification and that you know which type it is.
What Details Should
What Details Should You Check on a Certificate?
- Certificate number — Helps you identify and verify the specific report
- Diamond origin — Confirms whether the diamond is lab-grown or natural
- Carat or diamond weight — Shows the diamond size or total weight across the piece
- Colour and clarity — Shows quality grades where listed
- Cut — Helps understand light performance where included
- Jewellery gross weight — Important for jewellery reports; confirms total piece weight
- Gold purity — Confirms 14KT, 18KT, or other metal as declared
- QR code — Enables quick online verification where available
Certificate vs BIS
Certificate vs BIS Hallmark: What Is the Difference?
This is a common point of confusion. A diamond certificate or jewellery report covers the diamond — its origin, quality, and weight. A BIS hallmark covers the gold — it confirms that the gold in the piece has been independently tested and meets the declared purity standard.
They are two separate things. For a complete, well-documented piece of lab-grown diamond jewellery, you ideally want both: a certificate or jewellery report for the diamond, and a BIS hallmark on the gold. Do not assume that one replaces the other.
Check a Lab-Grown
How to Check a Lab-Grown Diamond Certificate
- Check the name of the issuing laboratory. Confirm it is a recognised lab — IGI, SGL, GIA, or another credible institution.
- Find the certificate or report number. This number uniquely identifies your document and can be used for verification.
- Confirm the diamond origin. The certificate should clearly state whether the diamond is lab-grown or natural. Do not assume — read it.
- Check carat weight, colour, clarity, and cut where listed. For a loose diamond certificate, all four should be present. For a jewellery report, total diamond weight and origin are the minimum to look for.
- Match the jewellery gross weight and metal purity if it is a jewellery report. The declared metal type (e.g., 18KT gold) and gross weight should match the piece you are receiving.
- Scan the QR code or use online verification where available. SGL and some other labs provide QR-enabled reports. A quick scan confirms the document is genuine.
- Ask the jeweller for clarification if any detail does not match. A reputable brand will be able to explain every line of your certificate clearly.
For a step-by-step walkthrough of verifying your document, see our guide on how to check a lab-grown diamond certificate.
What Stella Customers
What Stella Customers Should Check
At Stella Fine Jewellery, every piece comes with proper documentation — a jewellery report or certificate covering the diamonds, alongside BIS hallmarked gold. When you receive your Stella piece, check that the document clearly states the diamond origin as lab-grown, includes the jewellery or diamond weight, and lists the metal purity. If you have a QR code on your report, scan it for quick verification.
If you have any question about your Stella certificate or jewellery report, our team is available on WhatsApp to help you understand it. Certification transparency is something we take seriously, and we are happy to walk you through every detail of your documentation.
Final Certification Checklist
Final Certification Checklist
- Certificate is from a recognised laboratory (IGI, SGL, GIA, or equivalent)
- Diamond origin is clearly stated as lab-grown
- Certificate or report number is present and verifiable
- Carat weight or total diamond weight is listed
- Colour and clarity grades are included where applicable
- Jewellery gross weight and metal purity are confirmed on jewellery reports
- QR code is scanned and verified where available
- Gold hallmark is present and matches declared karat
- All details on the certificate match the piece you are receiving
Further Reading
- How to Check a Lab-Grown Diamond Certificate
- What Is the Difference Between Lab-Grown and Natural Diamonds?
- Are Lab-Grown Diamonds Real Diamonds?
- Lab-Grown Diamonds vs Natural Diamonds: Complete Comparison for Indian Buyers
- Are Lab-Grown Diamonds Worth Buying in India?
- The Complete Lab-Grown Diamond Buying Guide for India
Still asked
Which certificate is best for lab-grown diamonds?
IGI, SGL, and GIA are all credible grading laboratories used for lab-grown diamonds. IGI and SGL are widely used in the Indian market. GIA is widely recognised globally. Rather than focusing on which lab is "best," focus on confirming that the certificate clearly states diamond origin, weight, quality details, and has a verifiable certificate number. The clarity and completeness of the documentation matters most.
What is the difference between IGI, SGL and GIA?
IGI (International Gemological Institute) and GIA (Gemological Institute of America) are globally recognised grading laboratories that issue detailed diamond grading reports. SGL (Solitaire Gemmological Laboratories) is a prominent Indian lab that issues both grading reports and jewellery reports covering the full piece. Each operates with its own standards and report formats. In India, IGI and SGL are particularly common for lab-grown diamond jewellery documentation.
Is a jewellery report the same as a diamond certificate?
No, they are different. A diamond certificate covers a single loose diamond — its individual weight, cut, colour, clarity, and origin. A jewellery report covers a finished piece — total diamond weight, metal type, gross jewellery weight, and diamond origin. Both are legitimate and useful; the type you receive depends on the piece and the brand's documentation process.
What should I check on a lab-grown diamond certificate?
Check the issuing laboratory name, the certificate or report number, confirmation that the diamond is lab-grown, the diamond or total diamond weight, colour and clarity grades where listed, metal purity, and gross weight if it is a jewellery report. Also scan the QR code if available to verify the document is genuine.
Is BIS hallmark the same as diamond certification?
No. A BIS hallmark is a gold purity certification issued by the Bureau of Indian Standards. It confirms that the gold in the piece has been tested and meets the declared karat. A diamond certificate or jewellery report covers the diamond — its origin, weight, and quality. They are two separate, complementary forms of documentation. A complete piece of certified diamond jewellery should ideally have both.
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