This document shows what criteria DiamCalc uses for diamond grading according to AGA system
The data listed here is not an official AGA data. It is provided
here for possibility to check its suitability for your purposes.
OctoNus software recommends that you check the data and modify
it as necessary as described here
before using DiamCalc to grade diamonds for commercial purposes.
GirdleHeight_mm, mm (translation table for girdle thickness) |
Girdle description |
Values |
Extremely thin |
less than 0.4 |
Very thin |
0.4 - 1.0 |
Thin |
1.0 - 1.5 |
Slightly thin |
1.5 - 1.7 |
Medium |
1.7 - 3.0 |
Slightly thick |
3.0 - 4.5 |
Thick |
4.5 - 5.5 |
Very thick |
5.5 - 7.0 |
Extremely thick |
more than 7.0 |
Culet_mm, mm (translation table for culet size) |
Culet description |
Values |
Pointed |
less than 0.010 |
Very small |
0.010 - 0.020 |
Small |
0.020 - 0.030 |
Medium |
0.030 - 0.090 |
Slightly large |
0.090 - 0.220 |
Large |
0.220 - 0.400 |
Very large |
0.400 - 0.800 |
Extremely large |
more than 0.800 |
AGA appraiser tables and translation tables:
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