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Table 1.
The three diamonds shown in figure C have similar proportions.

Proportion

Commercial cut

Hearts On Fire

Fabrikant Brilliant

Crown angle

34.5°

34.0°

34.0°

Pavilion angle

41.0°

40.8°

41.2°

Table percentage

56%

54%

56%

Girdle thickness

4.3%

3.0%

4.0%

Total depth

62.5%

61.6%

62.3%

Star length

60%

55%

60%

Lower girdle length

80%

80%

80%

Average amount of indexing

3.5° (“painted” facets)

– 4.0° (“dug out” facets)

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