What is a Diamond Certificate?

A diamond certificate is a document created by an independent gemological laboratory that reports and verifies that specific diamond’s unique information like its color grade, carat weight, clarity grade and cut grade. You should always review the diamond’s certificate prior to purchasing it. There are several well-known gem labs in the United States. The most well-known grading laboratories are the International Gemological Institute (IGI), the Gemological Institute of America (GIA) and the American Gem Society (AGS).

A diamond's value and ultimately its cost are determined by objective characteristics referred to as the 4Cs: Color, Clarity, Cut and Carat. Each component is valuable of course, but the total value of a diamond is the sum total of all of its four characteristics considered in context to each other. Many consumers might assume that carat weight is the most valuable of the 4Cs, but color, cut and clarity actually contribute greater to the appearance of a diamond.

A diamond certificate may be referred to by a number of different names depending on where it was created. In some regions, it can be called a diamond grading report, or even a diamond quality document. Whatever names the issuer prefers it is a certificate created by an independent gemological laboratory, often by a team of gemologists, not just one individual. Using trained eyes, the diamond is evaluated and measured with a jeweler's loupe, a microscope, and other gemological instruments.


Who Grade Diamonds?

The certificate reports and verifies a specific diamond’s unique information including its color grade, carat weight, clarity grade and cut grade. You should always review a diamond’s certificate prior to purchasing your diamond so you will understand the quality of the stone. There are several well-known gem labs in the United States. The most recognized grading laboratories are the International Gemological Appraisals (IGA), International Gemological Institute (IGI), the Gemological Institute of America (GIA) and the American Gem Society (AGS).


What do Labs Report in Each Diamond?

Each diamond certificate indicates certain traits found in every stone. A diamond's value and ultimately its cost are determined by objective characteristics referred to as the 4Cs: Color, Clarity, Cut and Carat. Each component is valuable of course, but the total value of a diamond is the sum total of all of its four characteristics considered in context to each other. Many consumers might assume that carat weight is the most valuable of the 4Cs. But color, cut and clarity actually contribute greater to the appearance of a diamond.


Your diamond certificate provides another layer of confidence as to its quality, and its distinctive traits that identify and separate your stone from all others. A diamond certificate may be requested by your insurance company if you decide to insure it against loss or damage. Always keep your diamond certificate in a secure place for safekeeping. 

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