Transnational Gemmological Laboratories

About TGL

Professional gem testing, diamond jewellery reports and trusted laboratory services for the gem and jewellery industry.

Who We Are

Trusted Gemmological Expertise

TGL (Transnational Gemmological Laboratory) is a leading gemmological laboratory specializing in gemstone certification and advanced testing services for the gems and jewellery industry. TGL provides professional reports for natural gemstones, gemstone jewellery, natural and laboratory-grown diamond jewellery, along with parcel testing and detection of laboratory-grown diamonds (CVD/HPHT). With a commitment to accuracy, transparency, and advanced gemmological technology, TGL delivers trusted certification services to jewellers, manufacturers, traders, and customers worldwide.

Our laboratory uses updated technology, scientific methodology and professional expertise to support retailers, manufacturers, traders and end consumers with accurate and reliable reports.

TGL

Professional Gemologist

Combining integrity, commitment and technical knowledge to protect trust in every gemstone and jewellery report.

Our Foundation

Mission, Vision & Values

Built on accuracy, transparency and professional ethics.

Our Vision

To achieve excellence in service and complete customer satisfaction by offering the highest level of professionalism and becoming the preferred gemmological laboratory.

Our Mission

To protect clients and the trade by providing accurate, relevant and scientific information on gemstones, diamonds and jewellery.

Our Values

Fairness, integrity, professional ethics and commitment to best business practices guide every service and every report issued by TGL.

Why Choose TGL

ACCURACY. TRUST. EXCELLENCE.

Scientific Analysis

Every stone is reviewed with laboratory methodology and gemmological expertise.

Updated Technology

TGL continually upgrades technology and skills through research and development.

Industry Protection

Reports are designed to support retailers, manufacturers, traders and end consumers.

Ethical Standards

Our work is guided by accuracy, fairness, integrity and professional responsibility.

Reports & Laboratory Services

Diamond Report Natural Diamond Jewellery Report Laboratory Grown Diamond Jewellery Report Gemstone Report Gemstone Jewellery Report Moissanite Jewellery Report Diamond and Gemstone Jewellery Report Diamond Parcel Testing (Natural or Lab-Grown) Jewellery Marking

Our Team

Meet Our Professionals

We have gathered experienced professionals committed to reliable service.

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