Girdle Thickness Percentage Chart
You can use this chart to determine the thickness of a diamond's girdle as a percentage of average girdle diameter. You'll need to decide which girdle thickness term applies to the diamond and also calculate the average girdle diameter. Choose the thickness term, then follow that column down until you find the average girdle diameter. The figure at that point is the girdle thickness, expressed as a percentage of the diamond's total depth.
If the girdle is extremely thin or very thin, its contribution to the diamond's total depth is insignificant. That's why there are no columns for those two categories. On the other hand, a thin girdle and a medium girdle are so close in thickness that they make the same contribution to overall depth. They're combined in one "thin-medium" column.
|
Diameter |
Thin-Medium |
Slightly Thick |
Thick |
Very Thick |
Extremely Thick |
|
3.80 |
4% |
5% |
6% |
9% |
11% |
|
3.85 |
4% |
5% |
6% |
9% |
10% |
|
3.90 |
4% |
5% |
6% |
8% |
10% |
|
3.95 |
4% |
5% |
6% |
8% |
10% |
|
4.00 |
4% |
5% |
6% |
8% |
10% |
|
4.05 |
4% |
5% |
6% |
8% |
10% |
|
4.10 |
4% |
5% |
6% |
8% |
10% |
|
4.15 |
4% |
5% |
6% |
8% |
10% |
|
4.20 |
4% |
5% |
5% |
8% |
10% |
|
4.25 |
4% |
5% |
5% |
8% |
9% |
|
4.30 |
3% |
5% |
5% |
8% |
9% |
|
4.35 |
3% |
5% |
5% |
8% |
9% |
|
4.40 |
3% |
5% |
5% |
8% |
9% |
|
4.45 |
3% |
4% |
5% |
7% |
9% |
|
4.50 |
3% |
4% |
5% |
7% |
9% |
|
4.55 |
3% |
4% |
5% |
7% |
9% |
|
4.60 |
3% |
4% |
5% |
7% |
9% |
|
4.65 |
3% |
4% |
5% |
7% |
9% |
|
4.70 |
3% |
4% |
5% |
7% |
9% |
|
4.75 |
3% |
4% |
5% |
7% |
8% |
|
4.80 |
3% |
4% |
5% |
7% |
8% |
|
4.85 |
3% |
4% |
5% |
7% |
8% |
|
4.90 |
3% |
4% |
5% |
7% |
8% |
|
4.95 |
3% |
4% |
5% |
7% |
8% |
|
5.00 |
3% |
4% |
5% |
7% |
8% |
|
5.05 |
3% |
4% |
5% |
7% |
8% |
|
5.10 |
3% |
4% |
5% |
6% |
8% |
|
5.15 |
3% |
4% |
4% |
6% |
8% |
|
5.20 |
3% |
4% |
4% |
6% |
8% |
|
5.25 |
3% |
4% |
4% |
6% |
8% |
|
5.30 |
3% |
4% |
4% |
6% |
8% |
|
5.35 |
3% |
4% |
4% |
6% |
7% |
|
5.40 |
3% |
4% |
4% |
6% |
7% |
|
5.45 |
3% |
4% |
4% |
6% |
7% |
|
5.50 |
3% |
4% |
4% |
6% |
7% |
|
5.55 |
3% |
4% |
4% |
6% |
7% |
|
5.60 |
3% |
4% |
4% |
6% |
7% |
|
Diameter |
Thin-Medium |
Slightly Thick |
Thick |
Very Thick |
Extremely Thick |
|
5.65 |
3% |
4% |
4% |
6% |
7% |
|
5.70 |
3% |
4% |
4% |
6% |
7% |
|
5.75 |
3% |
3% |
4% |
6% |
7% |
|
5.80 |
3% |
3% |
4% |
6% |
7% |
|
5.85 |
3% |
3% |
4% |
6% |
7% |
|
5.90 |
3% |
3% |
4% |
6% |
7% |
|
5.95 |
3% |
3% |
4% |
6% |
7% |
|
6.00 |
3% |
3% |
4% |
6% |
7% |
|
6.05 |
2% |
3% |
4% |
5% |
7% |
|
6.10 |
2% |
3% |
4% |
5% |
7% |
|
6.15 |
2% |
3% |
4% |
5% |
7% |
|
6.20 |
2% |
3% |
4% |
5% |
6% |
|
6.25 |
2% |
3% |
4% |
5% |
6% |
|
6.30 |
2% |
3% |
4% |
5% |
6% |
|
6.35 |
2% |
3% |
4% |
5% |
6% |
|
6.40 |
2% |
3% |
4% |
5% |
6% |
|
6.45 |
2% |
3% |
4% |
5% |
6% |
|
6.50 |
2% |
3% |
4% |
5% |
6% |
|
6.55 |
2% |
3% |
4% |
5% |
6% |
|
6.60 |
2% |
3% |
3% |
5% |
6% |
|
6.65 |
2% |
3% |
3% |
5% |
6% |
|
6.70 |
2% |
3% |
3% |
5% |
6% |
|
6.75 |
2% |
3% |
3% |
5% |
6% |
|
6.80 |
2% |
3% |
3% |
5% |
6% |
|
6.85 |
2% |
3% |
3% |
5% |
6% |
|
6.90 |
2% |
3% |
3% |
5% |
6% |
|
6.95 |
2% |
3% |
3% |
5% |
6% |
|
7.00 |
2% |
3% |
3% |
5% |
6% |
|
7.05 |
2% |
3% |
3% |
5% |
6% |
|
7.10 |
2% |
3% |
3% |
5% |
6% |
|
7.15 |
2% |
3% |
3% |
5% |
6% |
|
7.20 |
2% |
3% |
3% |
5% |
6% |
|
7.25 |
2% |
3% |
3% |
5% |
6% |
|
7.30 |
2% |
3% |
3% |
5% |
5% |
|
7.35 |
2% |
3% |
3% |
4% |
5% |
|
7.40 |
2% |
3% |
3% |
4% |
5% |
|
7.45 |
2% |
3% |
3% |
4% |
5% |
|
7.50 |
2% |
3% |
3% |
4% |
5% |
|
7.55 |
2% |
3% |
3% |
4% |
5% |
|
7.60 |
2% |
3% |
3% |
4% |
5% |
|
7.65 |
2% |
3% |
3% |
4% |
5% |
|
7.70 |
2% |
3% |
3% |
4% |
5% |
|
7.75 |
2% |
3% |
3% |
4% |
5% |
|
7.80 |
2% |
3% |
3% |
4% |
5% |
|
7.85 |
2% |
3% |
3% |
4% |
5% |
|
7.90 |
2% |
3% |
3% |
4% |
5% |
|
7.95 |
2% |
3% |
3% |
4% |
5% |
|
8.00 |
2% |
3% |
3% |
4% |
5% |
|
8.05 |
2% |
2% |
3% |
4% |
5% |
|
8.10 |
2% |
2% |
3% |
4% |
5% |
|
8.15 |
2% |
2% |
3% |
4% |
5% |
|
8.20 |
2% |
2% |
3% |
4% |
5% |