Industry
π°
Jan 15, 2025
Understanding the New Era of Gemstone Certification
How advanced spectroscopy is revolutionizing the way we authenticate and grade precious stones...
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Since 2000 β Antwerp, Belgium
Trusted Expertise in
Gemstone Certification
International gemological laboratory providing comprehensive analysis and certification for diamonds, colored gemstones, pearls, and jewelry.
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Discover ALGT's commitment to excellence
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Enter Virtual TourAbout ALGT
Setting the standard in independent gemstone certification since 2000
The Antwerp Laboratory for Gemstone Testing (ALGT) is an independent gemological laboratory headquartered in the heart of Antwerp β the world's diamond capital. Founded in 2000, ALGT has built a reputation for precision, integrity, and innovation.
Our laboratory employs advanced spectroscopic techniques combined with classical gemological methods to deliver accurate and reliable certification for dealers, auction houses, jewelers, and private clients worldwide.
In addition to Antwerp, we operate a fully-equipped facility in Shanghai, China, serving the vibrant Asian gemstone market.
25+
Years
50K+
Reports
2
Laboratories
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Laboratory photo
Why Choose ALGT
Tradition meets cutting-edge technology
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Advanced Equipment
State-of-the-art gemological instruments for precise analysis
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Expert Gemologists
Team of internationally certified gemological professionals
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Global Recognition
Reports accepted and trusted by dealers worldwide
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Fast Turnaround
Efficient processing with rapid report delivery options
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Confidential & Secure
Your gemstones handled with utmost care and discretion
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Comprehensive Reports
Detailed analysis covering all critical gemstone parameters
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Personalized Service
Dedicated support tailored to your specific needs
Our History
A journey of growth and dedication to excellence
00
2000
ALGT founded in the heart of Antwerp's diamond district
05
2005
Achieved ICA membership, expanding international recognition
10
2010
Opened Shanghai laboratory to serve the Asian market
15
2015
Invested in next-generation spectroscopic equipment
18
2018
Introduced laser inscription services
20
2020
Launched digital report verification system
23
2023
Expanded services with 3D gemstone documentation
Our Team
Internationally certified gemologists
SM
Segers Marc
Founder & Director
Over 30 years of experience in gemology. Graduate Gemologist (GIA). Recognized expert in colored gemstones and diamonds with extensive knowledge of the global gem trade.
MY
Mingyue Yang
Director β Shanghai Laboratory
Gemologist with deep expertise in Asian gem markets. Leads the Shanghai laboratory operations, bridging European gemological standards with the Chinese market.
Our Services
Comprehensive gemological services for trade and private clients
Medium
Credit card size
Essential identification and grading in a compact format. Ideal for standard gemstones.
Gem Identification
Weight & Dimensions
Color Grade
Photo
Large
A4 format
Comprehensive report with detailed analysis. Industry standard for high-value colored gemstones.
Full Identification
Treatment Analysis
Origin Determination
Detailed Photos
UV Fluorescence
Luxury
Premium A4
Enhanced presentation with additional photographic documentation and spectroscopic data.
Everything in Large
Spectroscopic Data
Multiple Photos
Enhanced Graphics
Premium Paper
BEST
Premium
Prestige format
The ultimate gemstone passport. Bespoke documentation for exceptional and auction-grade pieces.
Everything in Luxury
Video Documentation
3D Mapping
Sealed Certificate
Leather Portfolio
Pricing
Transparent pricing for all our services
| Service | Medium | Large | Luxury | Premium |
|---|---|---|---|---|
| Identification | β¬30 | β¬50 | β¬80 | β¬120 |
| Identification + Origin | β¬50 | β¬80 | β¬120 | β¬180 |
| Full Report (no origin) | β¬40 | β¬65 | β¬100 | β¬150 |
| Full Report + Origin | β¬60 | β¬95 | β¬140 | β¬200 |
| Quick Check | β¬15 | β | β | β |
| Laser Inscription | β¬20 | β¬20 | β¬20 | Included |
| Seal | β¬10 | β¬10 | β¬15 | Included |
* Prices are indicative. Final pricing depends on gemstone type, size, and complexity.
Registration
Submit your gemstones for analysis
A downloadable PDF will be generated for you to sign and upload.
News & Library
Latest from ALGT and the gemological world
Laboratory
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Dec 20, 2024
ALGT Introduces Enhanced Origin Determination
Our laboratory has implemented cutting-edge trace element analysis for more accurate geographic origin reports...
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Education
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Nov 8, 2024
Gemology Workshop Series β Spring 2025
Registration is now open for our comprehensive colored gemstone identification workshops in Antwerp...
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Contact Us
Get in touch with our team
π§πͺ HEADQUARTERS
Antwerp, Belgium
πHoveniersstraat 30, 2018 Antwerp, Belgium
π+32 3 233 25 08
πMonβFri: 9:00 β 17:30
π¨π³ ASIA OFFICE
Shanghai, China
Proud member of
ICA
International Colored Gemstone Association
CMA
China Gems & Jade Exchange Center