Get accurate gemstone testing, certification, and grading in Kolkata by expert gemologists

Gemstone Testing, Certification & Grading in Kolkata

diamond, precious, stone, lab-grown diamond, lab created diamonds, man-made diamonds, diamond, diamond, diamond, diamond, diamond

01

Non-Destructive Gemstone Testing with Advanced Equipment

We use cutting-edge, non-invasive instruments such as refractometers, spectrometers, and UV lamps to test gemstones without altering or damaging them.

Detailed close-up of hands examining a white mineral stone outdoors.

02

Double Verification by Certified Gemologists

Each gemstone is tested and verified by two experienced gemologists, ensuring high accuracy, consistency, and expert evaluation.

Scientist in a lab coat using a microscope to conduct research, focusing on healthcare improvements.

03

Precise Detection of Gemstone Treatments & Enhancements

Our lab specializes in identifying common gemstone treatments like heat, dye, fracture-filling, and diffusion, providing complete transparency in certification.

04

Tamper-Proof Gemstone Reports with Digital Verification

GLK provides all gemstone certificates include magnified images and a unique QR code, allowing buyers to verify authenticity online anytime.

Our Process

How We Ensure Quality Results

Step

01

Certified Gemologist Inspection

Each gemstone is tested by trained gemologists to ensure accurate identification and grading.

Step

02

Advanced Lab Testing

We use modern gemological tools to detect treatments and verify authenticity with precision.

Step

03

Verified & Secure Certification

All reports undergo strict quality checks and include QR codes for online verification.

Join Us

Get Accurate Geological Testing for Your Projects Today!

Get Started