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About USGL
United States Gemological Labs – Since 1995
People from all over the world send their diamonds to the laboratory for grading and analysis. Our clients put their business in our hands and their trust in our expertise – and we are extremely careful with both.
- Natural Diamond Report
- Laboratory Grown Diamond Report
- Colored Stone Report
- Jewelry Report

Our Process
How We Guide

4Cs of Diamond
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Certification
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Testimonial
What Our Customers Say
Maria Rojas
Luxe Jewel Co.
We've relied on this lab for years, and their grading accuracy is unmatched. Their certifications are highly respected, which boosts our credibility with clients. Plus, their fast turnaround times help keep our business running smoothly.
David Lee
Jewel House
This lab's expertise in diamond grading has been a game-changer for us. Their detailed reports and consistent quality give us and our clients the confidence we need. Their customer service is also top-notch, always responsive and professional.
Anjali Mehta
Mehta Diamonds
In a competitive market, having a trusted certification partner is crucial, and this lab never disappoints. Their rigorous grading standards and quick service are exactly what we need. We've built a solid reputation thanks to their reliable certifications.
Michael Carter
Prestige Gemstones
We trust this lab for all our diamond grading needs because of their stringent standards and global recognition. Their reports are clear, comprehensive, and enhance the value of our gemstones. Their commitment to excellence truly sets them apart in the industry.
Trusted Gemologists with
29 Years of Experience
BLOGS
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