Diamond is the hardest known natural substance. It has a value of 10 on the Mohs scale of hardness, which rate from 1 to 10, with 10 being the hardest. Learn about the 4C’s which determine the quality of a diamond.
PESONA Jewelry sells GIA and AGS certified diamonds that has the highest grading standard and most renowned gemological lab in the world. Therefore, grading system in this page will be based on GIA and AGS grading system.
Cut refers to the proportions and finish of a stone. This is a crucial factor, which can affect prices greatly. A diamond’s cut affects its brilliance. If a diamond displays high brilliance, then it is well cut and has good proportions.
|Very Good||Very Good (AGS2)|
|Good||Good (AGS3, AGS4)|
|Fair||Fair (AGS5, AGS6, AGS7)|
|Poor||Poor (AGS8, AGS9, AGS10)|
In most cases, the higher the carat weight, the greater the price of the diamond. One Carat equals to 200 milligrams. See table below for approximate size
Clarity is defined as the degree to which a stone is free from external marks called blemishes and internal features called inclusions. F (GIA) or 0 (AGS) is the highest and rarest clarity grade. As the grade descend, so does the price.
|IF INTERNALLY FLAWLESS||1|
|VVS1 VERY VERY SLIGHTLY INCLUDED 1||1|
|VVS2 VERY VERY SLIGHTLY INCLUDED 2||2|
|VS1 VERY SLIGHTLY INCLUDED 1||3|
|VS2 VERY SLIGHTLY INCLUDED 2||4|
|SI1 SLIGHTLY INCLUDED 1||5|
|SI2 SLIGHTLY INCLUDED 2||6|
|I1 INCLUDED 1||7-8|
|I2 INCLUDED 2||8-9|
|I3 INCLUDED 3||9-10|
GIA: D is the highest and most rare colorless grade. As the grades descend towards Z, the price also decreases.
AGS: 0.0 is the highest and most rare colorless grade. As the grades descend towards 10.0, the price also decreases. See the GIA and AGS color grading system on the table below
Exception: diamonds with a natural body color, other than light yellow, light brown or light gray are called fancy color diamonds. These colored diamonds may cost a lot more than those that are colorless. For example, a one-carat natural pink diamond could sell for five to fifteen times more than a D color diamond of the same size and quality.