Gia Diamond Grading Scale

The gia laboratory issues diamond grading reports for loose natural diamonds in the d to z color range that weigh 0 15 carats or more.

Gia diamond grading scale.

The gia system for color grading fancy color diamonds is designed to accommodate the fact that not all colored diamonds have the same depth of color. Gia provides a diamond cut quality grade for standard round brilliant diamonds that fall into the d to z color range. Grading fancy color diamonds is complex and specialized and it takes highly trained laboratory graders to complete the process accurately. The universal measure of quality march 14 2013 the prospect of purchasing a diamond may seem daunting but through gia an unbiased authority on diamonds you have several handy resources to help you select the highest quality diamond.

Gia diamond grading reports are not issued for laboratory grown diamonds diamond simulants mounted diamonds or those that have undergone unstable treatments such as fracture filling or coating. Thus the gia scale starts at the letter d. Internally flawless category if diamonds have no inclusions visible under 10x magnification only small blemishes on the diamond surface. The gia diamond grading scale is divided into six categories and eleven grades.

Gia developed the definitive diamond color scale or. Very few people still cling to other grading systems and no other system has the clarity and universal acceptance of the gia scale. Like the color scale gia s clarity grading system developed because jewelers were using terms that could be misinterpreted loupe clean or piqué today even if you buy a diamond somewhere else in the world the jeweler will most likely use terms like vvs 1 or si 2 to indicate the clarity of a diamond even if his or her. Official gia color scale.

The gia diamond dossier is a more concise compact version of the gia diamond grading report and is available for diamonds that weigh between 0 15 and 1 99 carats. Gia also offers online only reports with full. Flawless category fl diamonds have no inclusions or blemishes visible under 10x magnification. To develop their cut grading system gia performed extensive computer modeling of round brilliant diamonds over a 15 year period and conducted more than 70 000 observations on actual stones to validate the research.

In this post you can learn about and download the official gia color scale work with an interactive diamond color chart to see the relationship between grades and colors and watch a useful gia diamond color grading video to see how gia evaluates diamond color. Gia diamond grading scales.