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| ROUND BRILLIANT FACET DIAGRAM | ROUND BRILLIANT DIAMOND |
Ak je diamant osadený v šperku, na výpočet približnej váhy jeho karátu sa používa nasledovný vzorec (Všetky rozmery sa uvádzajú v milimetroch.): najväčší priemer x najmenší priemer x hĺbka x .0061 = váha karátu
ROUND BRILLIANT CUT QUALITY
| CUT CLASSES |
1A |
1B |
2A |
2B |
| American Ideal Cut |
International fine trade cut |
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| Table % |
53-58% |
52-60% |
51.5-63% |
51-64% |
| Crown angle° |
34.0-34.7 |
33-35.1 |
32.1-35.8 | 31.6-36.4 |
| Crown height % | 14-16.3% | 13.5-16.8% | 11.6-17.9% |
11.1-18.1% |
| Pavilion Depth % | 42.8-43.2% |
42.5-43.5% |
42-44% | 41.5-44.9% |
| Girdle thickness Word descriptions and percentages. |
Thin to Medium (1.0% to 3.0%) Medium to Slightly thick (1.7% to 4.5%) |
Very thin to Slightly thick (0.4% to 4.5%) Thin to Slightly thick (1.0% to 4.5%) |
Very thin to Slightly thick (0.4% to 4.5%) |
Very thin to Thick (0.4% to 5.5%) |
| Total Depth % Determined by factors already considered above |
58-62.3% |
58.3-62.99% |
<58.3% >63% |
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| Polish/Symmetry Not a primary determining factor. |
Excellent -Very Good |
Excellent to Good |
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