• Thomas S. Fox Diamond Jewelers
• About Diamonds
• Engagement
• Exclusive Lines
• Gift Ideas
• Diamond Trade-In
• Jewelry Repair

Diamond Certification

Before purchasing a diamond, you should expect to review a copy of its certificate as proof that it has undergone an unbiased, professional examination.

A diamond certificate is a report created by a team of gemologists. The diamond is evaluated, measured, and scrutinized using trained eyes, a jeweler’s loupe, a microscope, and other industry tools. A completed certificate includes an analysis of the diamond’s dimensions, clarity, color, polish, symmetry, and other characteristics. Many round diamonds will also include a cut grade on the report.

What is the difference between the AGSL and the GIA certificates?

The Gemological Institute of America (GIA) and the American Gem Society Laboratories (AGSL) are among the most respected laboratories in the diamond industry. Both laboratories are highly respected due to their consistency and their conservative grading

We set our quality standards high to ensure you're choosing from the best selection. Come visit us and we can help you better understand how to choose the diamond that's right for you.