"Editor’s Note:
Every Facet Really Does Matter to the Appearance of a Round Brilliant Cut Diamond—Revisited
Based on correspondence received following the original publication of this article in the Feb. 13th edition of the GIA Insider, the authors have decided to clarify certain aspects of their description, and offer a revised version.
[Back to Top] [Print Article]
February 27, 2004"
GIA changed angles in Table1,Star length, Changed index for lower facets too, but save photo.
Some statements became more correct but more misleading for consumers in same time.
Below New Table1
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)
0°
– 4.0° (“dug out” facets)
Every Facet Really Does Matter to the Appearance of a Round Brilliant Cut Diamond—Revisited
Based on correspondence received following the original publication of this article in the Feb. 13th edition of the GIA Insider, the authors have decided to clarify certain aspects of their description, and offer a revised version.
[Back to Top] [Print Article]
February 27, 2004"
GIA changed angles in Table1,Star length, Changed index for lower facets too, but save photo.
Some statements became more correct but more misleading for consumers in same time.
Below New Table1
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)
0°
– 4.0° (“dug out” facets)