When buying diamonds, make sure you're getting the highest quality. Learn about diamonds and ASET® at AmericanGemSociety.org. Jewelry Association | Top Jewelers, Diamond Education
Diamonds / ASET®
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What quality of diamond should you buy? Beautiful diamonds are available to fit most budgets, but the beauty is in the diamond – not just the grade stated on a report. The precise criteria for evaluating the quality of a diamond is commonly known as the four Cs – Cut, Color, Clarity, and Carat weight. But, did you know that color, clarity, and carat weight are merely rarity factors? And, the rarer the diamond the higher the price.

Cut, however, is a beauty factor and its quality can affect the price by as much as 50% or more! This makes it very important to understand the differences in cut. It isn’t just the shape of the cut – round, princess, oval, etc. It’s the knowledge, expertise, and skill of the cutter to be able to place those tiny facets on a diamond at the correct angles. And, it’s the jeweler who has the knowledge, expertise, and integrity to recognize and choose the most beautifully cut diamonds for you.

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The American Gem Society Laboratories was the first professional laboratory to issue a grading report on the cut of a diamond (1996) and the only grading laboratory to issue a cut grade on fancy shaped diamonds. As the only laboratory licensed to use the American Gem Society Diamond Grading Standards, it issues the Diamond Quality® Certificate - the only true certificate which documents the cut, color, clarity, and carat weight and provides a guarantee of quality from the American Gem Society member jeweler who sells you the diamond. Proven Ethics, Knowledge, and Consumer Protection: that’s what every American Gem Society member pledges to you, the customer.

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Mission Statement

The American Gem Society (AGS) is a nonprofit trade association of fine jewelry professionals dedicated to setting, maintaining and promoting the highest standards of ethical conduct and professional behavior through education, accreditation, recertification of its membership, gemological standards, and gemological research.

The Society is committed to providing educational products to inform and protect the consumer and to contributing to the betterment of the trade by creating industry standards to protect the jewelry-buying public and the fine jewelry industry as a whole.

AGS Laboratories, founded to support the AGS mission, is a nonprofit diamond grading laboratory with a mission of consumer protection. Adhering to the AGS Diamond Grading Standards, AGS Laboratories is dedicated to offering diamond grading reports that provide consistency and accuracy based on science.

American Gem Society

8881 W. Sahara Ave. Las Vegas, NV 89117

info@ags.org (866) 805-6500