SGL Labs is a leading diamond certification lab that offers state-of-the-art diamond identification and grading services. We use the latest technology from around the world to make this possible and create flawless and accurate diamond reports. Our network of 18  laboratories helps us service the key diamond trading centers of London, New York, Dubai and Mumbai.

Our diamond reports contain the analytical result of the diamond 4Cs, the process of origin (natural or synthetic), the plotting diagram of the diamond’s physical characteristics (internal and external) and a graphical representation of its proportions.

This diamond certificate also provides additional information about the proportions of a diamond in detail along with the polish grade, symmetry grade, and proportions grade (only for standard round brilliant cuts) for the diamond.

Security Features of our Diamond Reports

Peace of mind, assured is not a motto for SGL, it’s an ethos! We believe that trust and reliability are essential factors when it comes down to providing peace of mind.

Every diamond certificate issued from our end is safeguarded and secured with various layers of protection, setting higher benchmarks for fair trade and professionalism. 


QR Code

UV & Micro text

Security Paper

Lab Policy

Access to data

Our diamond reports are freely available to view, verify and download. We make sure that all these diamond grading certificates are maintained systematically and can be presented on demand as a right to consumer perusal limited to the certificate.


Providing professional diamond identification and grading services backed with the latest technology SGL is at the front end of the laboratory-grown diamond detection scenario. SGL’s specialized services and laboratory-grown detection instruments help in the easy identification of natural diamonds.

Security features

UV text visible under UV/Blacklight, Secured 3D holograms and a special paper make the SGL's diamond certificate a document that cannot be tampered with or easily duplicated. The diamond sealing also displays many tamper-evident features to provide peace of mind.

Client anonymity

At SGL, we go above and beyond to ensure our clients' confidentiality and anonymity. We follow a system of barcodes and software modules to ensure the grading and processing of diamonds and their certificates are undertaken without any knowledge of the client details.

Additional Services

We provide unique additional services as per the consumer demands; tailored for your needs to add value to your diamond.

For further information, contact your nearest SGL Branch.

Hearts & Arrows

Hearts & Arrows is an overview of a diamond’s reflective scope and physical characteristics, carried out with a detailed assessment of its cut and overlapping projections.

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Laser Inscription

SGL tested diamonds carry laser inscribed numbers, letters, trademarks, and logos on the girdle of a diamond allowing the diamond to be easily identified. The inscription is visible under 10x magnification.
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Diamond Sealing is the ultimate security tool and ensures complete transparency and assurance of a diamond vis-à-vis the colour, clarity and cut grade.

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Frequently Asked Questions (FAQs)

Diamond certification is a process by which a diamond is evaluated and judged for its quality. This is done by checking the diamond’s 4Cs – Cut, Carat weight, Clarity, and Color. The diamond must pass several tests, including being cut and polished to the highest standards, and showing no signs of blemishes or inclusions. Diamond grading reports assure the buyer about the authenticity of the jewelry piece or loose diamond he’s purchasing.