We believe consumers should feel confident about their diamond purchase, that's why our mission is to provide the most accurate and consistent gemological services with uncompromising integrity and unparalleled customer care.Learn More
We believe experts should stand behind their work, that's why we issue Grading Certificates, not just grading reports. Our certificates come with a money-back guarantee so you can feel good knowing you got exactly what you paid for.Learn More
We believe in doing things the right way, not the easy way, that's why we don't cut corners. With only one location in the USA, we have complete control of maintaining high standards, training and consistency.Learn More
We believe having a traceable fingerprint of a diamond adds future protection to your investment, that's why we record the distinctive Gemprint of every diamond we certify. This light-emission DNA is positive identification.Learn More
We believe that photographs are an integral part of forensics, that's why we take multiple photographs of every diamond. From cut performance photos to laser inscription photomicrographs, each image adds to the identification portfolio.Learn More
We believe challenging ourselves leads to better performance, that's why our methods and procedures are independently audited annually, ensuring we uphold the standards of the ISO 17025 Forensic Laboratory Accreditation.Learn More
"Dear GCAL..we work with almost all major labs. None of which come close to the professionalism and courtesy, shown towards us the way only GCAL can."
Your certificates are always accurate and that's why I use them. I value them equally with GIA
"It has been a great partnership with GCAL, and everyone in the team goes above and beyond their role to help us meet our business objectives."
"You are the best in support and product. Gemprint is the best thing we have ever done."
"You guys are the best around. Once we point out your guarantee against what the bigger labs do, there are no more questions about your lab, you put your money where they can see it in writing. Please keep up the good work, you will continue to get our business"
"Excellent all around. A great resource for more than just grading stones. A+++++"
"GCAL always exceeds my expectations"
"All our employees love using the GCAL report when showing diamonds to our customers"
"Angelo and Don have been an absolute pleasure and have gone out of their way to help us combat issues of potential counterfeit jewelry being sold"
"It is a pleasure to do business with GCAL. The most professional and accurate lab I have worked with in my 30 years of being in the industry"
"Great company to deal with. Honest ,fair, and customer service is the best of any lab"
"Appreciate Mr. Palmieri's monthly overview of the state of the global diamond community"
"The services of GCAL are exceptional. Their verification process should be an industry standard. This is an essential consumer protection program"
"Fantastic organization with wonderful ethical culture"
"GCAL is open, transparent and very easy to work with, they really stand out against other laboratories"