Gia Diamond Grading Chart

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 chart. However these distinctions make a very. Each of the four c s carat weight cut color clarity is accompanied by a diamond chart illustrating the differences between grades. 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. Gia also offers online only reports with full.

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 scales. Gia developed the definitive diamond color scale or. And now gia report check is available for all gia reports providing you with an additional level of assurance.

Gia s d to z diamond color grading system measures the degree of colorlessness by comparing a stone under controlled lighting and precise viewing conditions to masterstones of established color value. Every diamond certified by the gia undergoes a thorough independent evaluation. Official gia color scale. Many of these diamond color distinctions are so subtle that they are invisible to the untrained eye.

Gia reports represent the highest standard of reliability consistency and integrity. This report includes all the important 4cs grading results as the diamond grading report but does not include the plotted diagram. 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. Booklet estimating a cut grade 6 34 mb revised december 2009 finish culet size and girdle thickness.

Gia provides a diamond cut quality grade for standard round brilliant diamonds that fall into the d to z color range. Categories of the gia diamond cut grading system. Chart estimating a cut grade high res 10 5mb suitable for large format printing chart in booklet form 10 pages. 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.

Here you will learn how gia diamond grades are established and how those grades affect the diamond s price.