Gia Diamond Cut Scale

Gia diamond clarity scale as found on gia diamond grading reports a diamond s clarity or its relative lack of inclusions and blemishes is graded on a scale ranging from flawless to included.

Gia diamond cut scale.

Evaluating the cut of a diamond is more complicated than its obvious shape. The gia diamond cut scale for standard round brilliant diamonds in the d to z diamond color range contains 5 grades ranging from excellent to poor and is the definitive scale for classifying diamond cuts. The 4cs means two very important things. Each diamond is placed on a gia measuring scale and weighed to fifth smallest decimal place.

Cut grade is assigned by the gia or lumera itself when there is no gia grade using the following scale. In fact when comparing our cut grade to that assigned by gia the lumera grade is equal to or lower than gia 90 of the time. Finish culet size and girdle thickness. The gemological institute of america established the diamond grading scale now accepted as a worldwide industry standard and is widely regarded as the world authority on diamond grading.

Gia created the 4cs color clarity cut and carat weight as a universal method for establishing the quality of any diamond anywhere in the world. The gia cut scale ranges from excellent to poor. While the gia ags igi egl and other grading agencies each have their own unique grading systems stonealgo s cut score is an unbiased and far more precise indicator of a diamond s light performance. Polish and symmetry culet size girdle minimum and maximum and painting and digging out.

Available only for round diamonds our cut score takes diamond cut grades to the next level. One carat equals 200 mg in weight. For round cut diamonds under 1 carat a vs2 or si1 clarity grade will give you an eye clean diamond sometimes even si2 doesn t have visible inclsuions. It is the world s most respected grading laboratory.

Categories of the gia diamond cut grading system explains and provides visual illustrations of the additional parameters that may limit the cut grade derived from the proportion combination. The gia does not sell or source stones. Like gia the lumera cut grade is based on a variety of factors and is conservatively applied. The size number position relief and the type of inclusion or blemish present and how easily they can be seen at 10x magnification determine a diamond s clarity grade.

How diamond cut affects appearance and beauty. Diamond quality can be communicated in a universal language and diamond buying consumers can know exactly what they are about to purchase. The gia cut grading system introduced in 2005 and validated by thousands of observations by retailers manufacturers and the public who looked at real diamonds and described why they thought certain diamonds were the best looking can help you understand what to look for in a well cut diamond.