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Expert certification and authentication backed by cutting-edge technology and decades of gemological expertise. Trusted by thousands across India.

Gem Testing & Certification
Laboratory of India
Gemstone Testing Report
Report No. GTCL-2605XXXX
Stone Natural Ruby
Weight 2.35 cts
Origin Myanmar
Treatment No Heating
✓ Verified Authentic

Our Certification Services

We provide industry-leading gemstone testing and certification services using the most advanced technologies available.

Gemstone Testing

Comprehensive physical and chemical analysis of all gemstone varieties including rubies, sapphires, emeralds, and more.

Diamond Grading

Precise diamond grading using internationally accepted 4C standards — Cut, Color, Clarity, and Carat weight.

Rudraksha Testing

Authentication and verification of Rudraksha beads confirming natural origin, species, and mukhi count.

Jewellery Report

Complete identification report for jewellery pieces including metal purity, stone identification, and craftsmanship notes.

Organic Gems

Testing for organic gemstones including pearls, coral, amber, and jet with full authenticity reports.

Batch Testing

Bulk testing services for retailers and wholesalers with individual certificates for each piece.

Know Your Gemstone

Learn about the unique properties, origins, and significance of precious and semi-precious gemstones.

1000s
Gems Tested
Expert
Professional Staff
15+
Years of Experience
95%
Client Satisfaction

Verify Your Certificate Online

Enter your certificate report number below to instantly verify the authenticity of your gemstone certificate issued by our laboratory.

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💎
GTCL CertificateVerified & Authentic
Report No.GTCL-2605XXXX
Stone NameNatural Ruby
Weight2.35 Carats
SpeciesCorundum
OriginMyanmar
TreatmentNo Heating
✓  Certificate Verified Authentic

What Our Clients Say

★★★★★
“

I sent a few stones from my collection to GTCL for testing. Their certification confirmed the emerald's quality and authenticity.

S
Sanjay Verma
Gemstone Enthusiast
★★★★★
“

Buying my first significant gemstone was an important investment. Their service is invaluable. Gave me complete peace of mind.

D
Deepika Nair
First-time Buyer
★★★★★
“

Accuracy is everything in my business. GTCL delivers reliable grading reports my clients trust.

R
Rajesh Gupta
Wholesale Dealer
★★★★★
“

As a designer I need authentic stones. GTCL's reports are internationally respected.

P
Priya Mehta
Jewellery Designer
★★★★★
“

For Vedic gemstone recommendations accuracy is paramount. GTCL's detailed reports give my clients full confidence.

A
Amit Sharma
Astrology Consultant
★★★★★
“

GTCL certificates have boosted my online sales tremendously. Customers feel secure.

S
Sunita Krishnan
Online Seller

Professional Gemstone Certification

Our internationally recognised certificates provide detailed analysis and authenticity verification for your precious gemstones.

🏛️

Approved Gemological Laboratory

State-of-the-art technology for accurate gemstone analysis.

✅

Certified Authenticity

Reports issued by professional gemologists with decades of experience.

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Fast Turnaround

Certificate within 3–5 working days, with express options available.

About Our Lab Get in Touch
GTCL · Gem Testing & Certification Laboratory
Gemstone Testing Report
Report No. GTCL-2605XXXX
Stone Natural Ruby
Weight 2.35 cts
Origin Myanmar
Treatment No Heating
Species Corundum

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