Optimal facet placement is the key to
Diamond Design Study of the Reflection and Refraction of Light in Diamond. The single descriptive words are as follows Excellent, Very Good, Good, Fair, and Poor. A diamond that has the top facet or table facet exactly perpendicular to the bottom of the diamond or pavilion and has its other facets precisely aligned with excellent symmetry, show patterns that look like arrows from the bottom and hearts from the top. Optimal facet placement is the key to brilliance and more important than facet patterning.
Some diamonds with painted girdles receive lower grades in the GIAs cut grading system, for reasons explained in the GIA article Painting and Digging Out. The AGA standards be the strictest. OctoNus, Moscow State University, Bruce Harding, and others have posted work there. Holloway, Garry 20002004. However, we know that diamonds appearance is composed of many light paths that reflect considerably more than two times within that diamond. Although diamonds are highly symmetrical, light can enter diamond from many directions and many angles. Spon, Ltd.
As of an HCA score below two represented an excellent cut. D. N., to give but two examples. Because every facet has the potential to change light rays plane of travel, every facet must be considered in any complete calculation of light paths. These stones such as EightStarbrand diamonds have less light leakage at the edge of the stone for given crown angle, pavilion angle, and table ratio, and have worse optical performance their upper girdle facets touch the girdle.
Not all ideal round cuts will have the hearts and arrows property is indicative of toptier cut, it does not always mean the diamond will be the brilliant. Many girdles have 32, 64, 80, or facets these facets are not counted in the total. The single descriptive words are as follows Excellent, Very Good, Good, Fair, and Poor.
This factor further highlights the need to reevaluate Tolkowskys results, and to recalculate the effects of diamonds proportions on its appearance aspects. Another important point to consider is that Tolkowsky did not follow the path of ray that was reflected more than twice in the diamond. Spon, Ltd. David Atlas who developed the AGA standards has suggested that they are overly strict. The HCA changed several times between and What did Tolkowsky really say?
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