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| PEAR BRILLIANT FACET DIAGRAM | PEAR BRILLIANT | FANCY YELLOW PEAR DIAMOND |
Ak je diamant osadený v šperku, na výpočet približnej váhy jeho karátu sa používa nasledovný vzorec (Všetky rozmery sa uvádzajú v milimetroch.): dĺžka x šírka x hĺbka x 2,417 x ,0018 = váha karátu
CUT GRADE DETERMINANTS FOR PEAR CUT DIAMONDS
| CUT CLASSES |
1A |
1B |
2A |
2B |
3A |
3B |
4A |
4B |
| Ideal |
Premium |
International fine trade |
US domestic average |
below average |
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| Table % |
55-60% |
53-61.5% |
52-62% |
51-64% |
51-67% |
49-70% |
48-72% |
>72% <48% |
| Crown Height % |
12-15% |
11.5-16% |
11-16.6% |
10.1-17.5% |
9-18% |
8.3-18.9% |
7.8-19.5% |
<7.8% >19.5% |
| Girdle thickness Word descriptions and percentages. |
V. Thin to Sl. Thick (0.4%-4.5%) or Thin to Thick (1%-5.5%) |
V.Thin to Thick(0.4%-5.5%) |
Very Thin to Very Thick (0.4% to 7.0%) |
Extremely thin to Extremely thick (0.0% to >7.0%) |
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| Total Depth % |
59.0-63.0% |
63.1-65.4% |
56-68.5% |
46-71% |
43-73% |
>73% < 43% |
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| Length:Width Ratios Trade preferences. A matter of personal taste and choice. |
1.50-1.75 |
1.26-1.99 |
> Class 3 < Class 3 |
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| Polish/Symmetry Not a primary determining factor. |
Excellent to Good |
Good or Fair |
Poor to Fair |
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