The AGS Laboratories offers diamond-grading services to members of the jewelry industry only. Our diamond grading reports provide an expert opinion from an unbiased, independent third-party diamond laboratory for the consumer. We grade both mounted and unmounted diamonds.
Any diamond shape can receive a diamond grading report, but we can only assign a diamond cut grade for loose diamonds that are Round Brilliants, square Princess cuts, Emerald cuts, Oval cuts, and Cushion cuts. We do not grade fancy color diamonds.
You can visit our AGS Laboratories Report Verification page. This enables you to check that the information on your diamond grading report matches the information stored in the AGS Laboratories report database. To check the diamond grading report, please enter your AGS report number and the carat weight from your diamond grading report..
If your business is in the jewelry trade, we’ll be happy to set up an account. Please see Become a Client or call Client Service. If you’re not in the jewelry trade, please visit an American Gem Society retail jeweler in your area. An AGS retail jeweler may be able to submit the diamond to the AGS Laboratories for you.
If your business is in the jewelry trade, we’ll be happy to set up an account and inscribe your diamond. Please see Become a Client or call Client Service. If you’re not in the jewelry trade, please visit an American Gem Society retail jeweler in your area. An AGS retail jeweler may be able to submit the diamond to the AGS Laboratories for you.
If your business is in the jewelry trade, we’ll be happy to set up an account and provide a replacement document. Please contact us. If you’re a consumer, you can request a replacement document directly from the Laboratory. Please contact us and provide the AGS number for the document you’ve lost.
A company memo or invoice must accompany each shipment. Inbound shipments can be made using your choice of carrier.
If shipping loose diamonds, each stone should be listed on the memo, along with the carat weight and U.S. dollar value. Each diamond submitted must be in an individual diamond parcel paper, and the paper must indicate the weight.
If shipping mounted goods, please clean them before shipping. Be sure to list each item on the memo, along with the carat weight and U.S. dollar value. Each item submitted must be in an individual parcel paper or plastic bag, and the paper or bag must indicate the weight.
We grade both loose and mounted diamonds. The AGS Laboratories is a trade-only diamond laboratory and only accepts diamonds from jewelers and manufacturers. If you would like to have your diamond receive an AGS Laboratories diamond grading report, we recommend you find an American Gem Society jeweler in your area.
The AGS Laboratories screens every diamond for potential treatments like High Pressure High Temperature (HPHT), fracture filling, and laser drilling. The AGS Laboratories will grade an HPHT-treated diamond if the fact of its treatment is disclosed upon receipt. The AGS Laboratories does not grade fracture-filled diamonds. However, the AGS Laboratories does grade diamonds that have been laser drilled. All treatments are disclosed in the "Comments" section of an AGS Laboratories diamond grading report.
You should take your diamond to be cleaned and inspected by a professional jeweler at least once a year. If you are cleaning your diamond at home, you can purchase cleaning agents at your jeweler. You may also use a solution of warm water and a mild liquid soap. Apply the solution to the diamond gently, using a cotton swab or soft bristle toothbrush; rinse thoroughly and dry with a soft cloth..
There is much debate in the diamond industry about what constitutes an actual Ideal Cut. An AGS Ideal Cut is a diamond where all the diamond’s Cut quality factors (light performance, proportions, and polish and symmetry) exist at the highest possible levels, making the maximum contribution to the diamond’s beauty and value.
The AGS Laboratories uses the AGS Performance-Based Cut Grade system, which is based on the overall performance of a diamond, specifically in the area of Light Performance. When analyzing the overall performance of the diamond, we take the following into consideration: light performance (contrast, leakage, dispersion, and brightness), proportion factors (girdle thickness, Culet size, Weight Ratio, durability, and tilt), and finish (Polish and Symmetry).
Yes. In 2006, the American Gem Society released its fancy shape Cut Grade research, which concluded five years of research by a team of diamond experts, optical physicists, and mathematicians. The AGS Laboratories' Diamond Quality® Document was the first diamond grading report ever to issue a fancy shape diamond cut grade. Currently, the AGS Laboratories is grading the Princess cut, Emerald Cut, Oval cut, and Cushion cut shapes. Other fancy shapes will follow.
Brilliance factors in both a diamond’s brightness and contrast. When a diamond gives off a large amount of light through the table, it is considered brilliant. When some facets are darker than others in intense lighting (think sunlight), the diamond will appear brighter.
Contrast is the effect created by the light and dark patterns seen when observing a faceted diamond. This can be positive or negative in its optical effect. Usually it is caused by, but not limited to, the observer's head.
Proportions are the size and angular relationships among the main parts of the diamond. AGS Laboratories diamond graders consider the following factors when evaluating Proportions: Table Size, Crown Angle, Girdle Thickness, Pavilion Angle, Culet Size.
Commonly referred to as “sparkle,” Scintillation is the effect that occurs when the diamond, the observer, or the illumination conditions are in movement. When movement occurs, flashes of both white and colored sparkles can be seen. The white sparkles are defined as Flash Scintillation and the colored sparkles as Fire Scintillation.
A Flash Scintillation Map map is a computer generated map showing the areas of the diamond that have the highest probability to exhibit flash scintillation across the broadest range of lighting conditions.
Carat Weight is a diamond's physical weight measured in metric carats. One metric carat equals 0.200 grams, or one-fifth of a gram. In more familiar terms, that is a little more than 0.007 of an ounce avoirdupois. (Avoirdupois is the common weight system we use in the United States.) For precision, the carat is further divided into hundredths, and each of those is called a point. In the AGS Laboratories diamond lab, Carat Weight is measured using a digital scale.
Clarity is the degree to which a diamond is free from inclusions and blemishes. Inclusions are internal characteristics; blemishes are external characteristics. Many diamonds have Clarity characteristics that can be seen only with magnification. The Clarity grade is subjectively based on the nature, location, size, quantity, and relief of the inclusions. At the AGS Laboratories, a minimum of two experienced diamond graders grade each diamond for the Clarity grade.
Color normally refers to where a diamond's Color falls within the range from colorless to light yellow or light brown. At the AGS Laboratories, the Color of a diamond is determined by at least two experienced color diamond graders using a set of master diamonds..
No. The AGS Laboratories provides an unbiased, independent, and expert third-party opinion on the 4Cs of a diamond. You never should see an appraisal amount on a diamond grading report. Price should be determined by the jeweler, not the laboratory.
Each diamond grader is required to pass the Gemological Institute of America (GIA) Diamond and Diamond Grading courses. In the AGS Laboratories, several Certified Gemologists oversee the work of each diamond grader.
Using a microlaser beam, the AGS Laboratories can inscribe the assigned AGS number, brand logos, and messages on the girdle of a diamond. Laser inscription does not damage the diamond nor does it affect the Color or Clarity of a diamond. The laser inscription can be viewed with a jeweler’s loupe.
The AGS Diamond Quality® Document (DQD) is the world's leading diamond report for Cut, and the first one offering a performance-based cut grade for the Round Brilliant as well as for fancy cuts, including Princess, Oval, Emerald and Cushion-shape diamonds. The DQD also provides a complete grading analysis of Color, Clarity, and Carat Weight. We examine the performance of a diamond — how it handles and refracts light. With the DQD, diamonds can receive a Cut Grade up to AGS Ideal.
The AGS DQD also is available in the Platinum DQD format. This format provides the same detail as the DQD; it also includes a light performance map based on patented AGS ASET® technology.
The AGS Diamond Quality® Report offers a complete grading analysis of a diamond, including the profile with measurements, and a custom plot. The Diamond Quality® Report provides an option for diamonds that have less-than-Ideal grades on Cut, Polish, or Symmetry and, therefore, shows a maximum grade of AGS 1 (Excellent).
The Diamond Quality® Report (DQR) is available in a number of formats, can be printed for any shape diamond, and is available with or without the AGS performance-based cut grade. The maximum grade available on the DQR is AGS 1 (Excellent).
The AGS Laboratories proportion-based Gold Diamond Quality® Report (DQR) is based upon the patented AGS light performance system and provides a proportion-based Cut Grade for the standard Round Brilliant stone. This report can be printed for any shape diamond. The Gold DQR report offers a complete grading analysis of the 4Cs: Cut (standard Round Brilliant), Color, Clarity, and Carat Weight, and features word descriptors ranging from Ideal to Very Poor, so that it gives a clear, concise explanation of the diamond's quality.
The Diamond Quality® Analysis (DQA) is a pocket-size document for stones weighing up to 1.99 carats. The DQA offers a complete grading analysis, without a plot, and includes one required laser inscription for diamond identification. This is the perfect document when you need all the details for diamonds weighing less than two carats in an easy-to-travel format. With the DQA, diamonds can receive a Cut Grade up to AGS Ideal.
The AGS Diamond Quality® Certificate (DQC) is a diamond grading report available exclusively for American Gem Society retail jewelers. This is the first and only certificate to guarantee authenticity and provide accountability for the diamond’s grade.
The DQC provides a complete diamond grading analysis of the 4Cs: the diamond’s Cut Grade, Color Grade, Clarity Grade, and Carat Weight, as well as the light performance map (AGS ASET® image) and any laser inscriptions on the girdle of the diamond. The DQC comes in a high-quality presentation folder and is not laminated, so the AGS titleholder may sign the certificate, ensuring this diamond is certified and of the highest quality.
The AGS Diamond Consultation™ (DC) is a product for diamonds weighing 4.99 carats or less and provides Shape, Weight, Clarity, and Color information about the diamond, as well as a plot of the diamond inclusions and/or blemishes. The DC provides, in a compact credit-card size fold-over document, a concise snapshot of a diamond with an easy-to-read spine for quick filing and identification.
The AGS Laboratories Scintillation Report is a limited-production addendum report available exclusively for the RITANI Reserve program. The information provided in the report supplements the grading information provided in an accompanying grading report and certifies that the physical specifications and assigned quality grades are accurate within recognized gemological tolerances. The supplementary information provided in the Scintillation Report includes a Flash Scintillation Map, a Fire Scintillation Map, a Scintillation Patterning Map, and a photomicrograph of the diamond.
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.