ISO 9001:2015 Certified Gemological Testing Laboratory DL Roy Rd, Near Krishnagar Municipality, Krishnagar, Nadia – 741101
+91 7548016604 info@koustav.com
Koustav Gemological Laboratory ISO 9001:2015
Verify Certificate
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DL Roy Rd, Near Krishnagar Municipality, Krishnagar
ISO 9001:2015 Certified Gemological Testing Center
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Online Gemstone Certificate Verification

Verify authentic laboratory test reports, refractive indices, specific gravity measurements, and microscopic inclusions directly from our ISO 9001:2015 certified registry.

ISO 9001:2015 Certified Verification
Search your verified gems

Enter your laboratory reference number to view and download full diagnostic specifications.

Instant Certificate Lookup
Tamper-Proof Digital Seal
High-Precision Diagnostic Data
Quick Guide

How Online Verification Works

1
Find Reference Number

Locate the unique Reference Number printed on your physical card certificate or scan the cryptographic QR seal.

2
Query Database

Enter the reference number in the search box above to instantly query our secure ISO 9001:2015 diagnostic database.

3
Inspect 14 Parameters

Review all 14 scientific diagnostic test parameters, microscopic gemstone photo, and digital authenticity certificate.