SGL Labs is a leading gemstone laboratory with around 18 labs across the globe.

Our state-of-the-art equipment and commitment to ongoing research and development ensure that we are always at the forefront of the gemstone testing industry.  We are also known as the best gem testing lab in India.

Our gemstone reports provide a comprehensive analysis of the gemstone, including its origin, treatment, and quality. The report also includes a detailed description of the gemstone, including its carat weight, shape, colour, clarity, and cut.

Security Features

Peace of mind, assured is not just a motto for SGL, it is a promise of trust and reliability. Every 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


Access to data

Our Gemstone Reports are freely available to view, verify and download. All the SGL gemstone certification data is maintained systematically and can be presented on demand as a right to consumer perusal limited to the certificate.


SGL is a professional diamond/ Gemstone identification and grading service that uses the latest technology. With specialized services and laboratory-grown detection instruments, SGL makes it easy to identify natural diamonds.

Security features

The SGL Gemstone Report/ Certificate is a document that cannot be tampered with or duplicated easily. The special paper, UV text visible under UV/Blacklight, and secured 3D holograms make it difficult to tamper with this document. Our diamond sealing also displays many tamper-evident features, providing peace of mind to the holder of the certificate.

Client anonymity

SGL goes to great lengths to protect client confidentiality and anonymity. We use a barcode system and software modules to grade and process diamonds and their Gemstone certificates without ever knowing the client's identity. This ensures that our grading is unbiased.

Additional Services

We provide unique additional services; 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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