RAPLAB® GRADING CRITERIA
The 4 C’s are part of a well-known grading system for evaluating diamonds by grading the carat weight, color, clarity and cut. RAPLAB® grades diamonds based on the 4 C’s and several additional criteria using sophisticated technology to provide you with a more detailed and informative certification.
There are nearly 2,000 different diamond shapes, with the round brilliant cut being most common.
ROUND, STANDARD, BRILLIANT CUT
![](https://www.raplab.com/wp-content/uploads/2018/06/RoundShape.jpg)
RECTANGULAR, STANDARD, STEP CUT
![](https://www.raplab.com/wp-content/uploads/2018/06/RectangularShape.jpg)
DIAMOND SHAPES
Today, there are eight traditional brilliant cuts:
-
- Round (RB )
- Cushion(CB)
- Heart (HB)
- Marquise (MR)
- Oval (OV)
- Pear (PS)
- Rectangular
- Square (SQ)
There are other shapes as well; the most familiar are:
- Emerald (EM)
- Radiant (RD)
- Princess (PR)
- Triangular (TR)