Certified Gemstone Testing & Grading You Can Trust

GLK offers accurate gemstone identification and grading with 24-hour certified reporting. Trusted expertise meets advanced technology.

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Years of Experience

Team Members

Satisfied Customer

Project Completed

Our Journey

GLK means From Vision to Verification

Crafting GLK’s Legacy in Gemology

From humble beginnings in Kolkata, GLK has grown into a trusted leader in gemstone testing and certification. Our journey is built on precision, passion, and a steadfast commitment to authenticity.

Trusted Certification by GLK

Scientific Expertise at GLK

Fast & Reliable GLK Service

All about us

01

Custom Testing & Analysis

02

Origin & Treatment Detection

03

Instant Report Check

Our Services

Comprehensive Geological Testing Services We Offer

At GLK – Gemological Laboratory Kolkata, we specialize in expert gemstone testing and certification. Using advanced technology, we deliver accurate, reliable reports that guarantee the authenticity and quality of your precious gems.

Ready to elevate your projects with accurate geological data? Contact us today!

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Our Process

How We Ensure Quality Results

Step

01

Initial Gemstone Inspection

Visual & physical check

Step

02

Laboratory Analysis

Advanced testing methods

Step

03

Final Certification

Detailed report issued

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Get Accurate Geological Testing for Your Projects Today!

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