Since 2019 — Antwerp, Belgium

Trusted Expertise in
Gemstone Reports

International gemological laboratory providing comprehensive analysis and reports for diamonds, colored gemstones, pearls, and jewelry.

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About ALGT

Setting the standard in independent gemstone reports since 2019

The Antwerp Laboratory for Gemstone Testing (ALGT) is an independent gemological laboratory headquartered in the heart of Antwerp — the world's diamond capital. Founded in 2019, 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 reports 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.

Years

150K+

Reports

Laboratories

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 Equipment

State-of-the-art instruments powering our analysis

Renishaw inVia™ Confocal Micro-Raman Microscope

LIBS — Laser Induced Breakdown Spectroscopy

EDXRF QUANT'X Spectrometer

FTIR — Fourier-Transform Infrared Spectroscopy

UV-Vis-NIR Spectroscopy

DiamondView™

DTC Melee Sorting Machine

J-SCREEN Diamond Screener

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Our History

A journey of growth and dedication to excellence

2019 Antwerp

ALGT Established in Antwerp

2021 Antwerp

Team Grew to Nine Members

2023 Shanghai

ALGT Shanghai Launched

2024 Shanghai

CMA Accreditation in Shanghai

2024 Shanghai

Shanghai Lab Relocated to Ocean Building

2025 Antwerp

Micro-Raman Spectrometer Acquired

2026 Shanghai

Consumer Rights Day in Shanghai

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Our Team

Internationally certified gemologists

Mingyue Yang

Director & Chief Gemmologist

Co-founder of ALGT. Senior gemmologist with expertise in gemstone testing, laboratory operations, and gemmological research, including pearl-related publications.

Segers Marc

General Manager & Chief Gemmologist

Co-founder of ALGT. Over 30 years of experience in gemology. FEEG diploma holder and recipient of the KIEA Gold Medal for diamond expertise from the King of Belgium.

Meet Our Team

Our Services

Comprehensive gemological services for trade and private clients

Medium

Bi-fold Report

21 × 14.7 cm

Bi-fold Report
Full Identification
Treatment Analysis
Origin Determination
Photo of Item

Large

Tri-fold A4 Report

29.5 × 21 cm

Tri-fold Report
Full Identification
Treatment Analysis
Origin Determination
Detailed Photo
Two Spectrum Data Charts

Luxury

Hardcover Two-fold Folder

36 × 27 cm

Full Identification
Treatment Analysis
Origin Determination
Detailed Photo
Two Spectrum Data Charts
Additional Information Sheet

BEST

Premium

Hardcover Prestige Booklet

60 × 27 cm

Elegant Blue Hardcover (4–5 pages)
Stunning High-Resolution Photography
Detailed Inclusion Imagery
Insightful Description of the Item
Origin Introduction
Bespoke for High-Value Pieces

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Service Price List 2025

In Euro, Excl. 21% VAT

Natural Diamond Report (loose)

Carat Weight	Fee (€)
≤0.29	32
0.30-0.49	37
0.50-0.99	42
1.00 +	45/ct

Rough Diamond Identification Report

Carat Weight	Fee (€)
≤0.99	30
1.00 +	30/ct
Yield Calculation ≤0.99	40
Yield Calculation 1.00 +	40/ct

Laboratory-Grown Diamond Report (loose)

Carat Weight	Fee (€)
Any weight	25

* ALGT reserves the right to change these prices at any time. Discounts may be applicable for large volumes.

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News & Library

Latest from ALGT and the gemological world

Assessing Two Orangy-Pink Sapphires for the Padparadscha Designation

Identification

Nov 10, 2026

Assessing Two Orangy-Pink Sapphires for the Padparadscha Designation

Two orangy-pink sapphires were submitted to ALGT for examination: a 1.08 ct heart-shaped stone and a 1.01 ct cushion-shaped stone. Their similar colour raised a question for the laboratory: would both qualify for the designation “Padparadscha sapphire”…

Research

Nov 10, 2026

Ruby Treatments and Reporting

Several treatments can improve a ruby’s appearance. Heating is the most common and best known. Fissure filling and diffusion can also alter a ruby’s appearance…

ALGT Opens a Gemstone Intake and Sorting Centre in Idar-Oberstein

Events

Oct 1, 2026

ALGT Opens a Gemstone Intake and Sorting Centre in Idar-Oberstein

On 1 October 2026, ALGT opened a gemstone intake and sorting centre in Idar-Oberstein, Germany. Located at Mainzer Straße 43 and managed by Vedat Pala, the centre gives jewellery professionals and gemstone enthusiasts a convenient local point of contact…

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Contact Us

Get in touch with our team

🇧🇪 HEADQUARTERS

ALGT Antwerp

📍Hoveniersstraat 55, 2018 Antwerp, Belgium

📧[email protected]

📞+32 3 535 08 88

🕐Mon–Fri: 9:00 – 17:30

🇨🇳 ASIA OFFICE

ALGT Shanghai

📍Room 1201, Ocean Building, 550 East Yan'an Road, Huangpu District, Shanghai