America's Premier Gemological Institute
Established in 1991, GI USA INC stands as one of America's oldest and most trusted gem testing laboratories. For over three decades, we have been at the forefront of gemological science, employing advanced spectroscopy, microscopic analysis, and cutting-edge authentication technologies to ensure the highest standards of gem certification.
ISO 17025 Certified
Internationally accredited laboratory meeting the highest quality standards
Advanced Testing
State-of-the-art equipment including FTIR, UV-Vis, and microscopy analysis
Blockchain Security
Tamper-proof digital certificates secured with blockchain technology
What Our Clients Say
"GI USA INC provided exceptional certification services for our jewelry collection. Their detailed analysis and professional reporting gave us complete confidence in our gemstone authenticity."
"The most thorough and professional gemological service I've encountered. Their 33+ years of experience really shows in the quality of their work and attention to detail."
Gemstone Verification Portal
Enter the unique CODE from your official GI USA INC email to authenticate and download your detailed certificate.