Diamond Cut
- Thread starter Elaken
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- Jan 20, 2009
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Diamonds of similar proportions and shape can appear dramatically different when viewed through an ASET scope due to variances in the consistency of facet shape, size and alignment. Each diamond must be evaluated on it's own merits individually.
Note that the ASET image provided when looking through an ASET scope is only a very small piece of the ASET puzzle and only provides limited insight into the optical symmetry of the diamond - which is not the intention behind the ASET scope, which is actually intended to address the concept of brightness and to determine where in the hemisphere the diamond is gathering light from as represented by the different colors:
Green = 0° (the horizon) to 45°
Red = 45° to 75°
Blue = 75° to 90°
Red represents light coming from angles where there is likely to be bright, direct sources of illumination in most viewing environments. This color is dominant in the ASET image of a well-cut diamond.
Blue corresponds to light that normally is blocked by the viewer’s head and body. An ASET image with a moderate amount of this color in an attractive pattern means the diamond has good contrast.
Green is produced by low-angle light, which usually is reflected from walls or other objects in the surrounding area (rather than coming from direct sources). A diamond with a high cut quality may show small amounts of this color around the bezel area of the ASET image.
Note that when Red and Green areas appear mixed together in the center region of the diamond (above the culet) this simply indicates a kind of crossover between the sources of illumination within the realm of the 45° viewing angle.
Black or White appears in areas that do not return light under real-life viewing conditions. If a diamond is well cut, the ASET image will show only very small areas of black or white around the outer edge (and perhaps none).
The ASET evaluation process provided by the AGS Laboratory relies on a reverse mathematical ray tracing analysis that is conducted by a super computer which then evaluates the diamond as seen from more than 200 different degrees of tilt, not just a single static view.
Note that the ASET image provided when looking through an ASET scope is only a very small piece of the ASET puzzle and only provides limited insight into the optical symmetry of the diamond - which is not the intention behind the ASET scope, which is actually intended to address the concept of brightness and to determine where in the hemisphere the diamond is gathering light from as represented by the different colors:
Green = 0° (the horizon) to 45°
Red = 45° to 75°
Blue = 75° to 90°
Red represents light coming from angles where there is likely to be bright, direct sources of illumination in most viewing environments. This color is dominant in the ASET image of a well-cut diamond.
Blue corresponds to light that normally is blocked by the viewer’s head and body. An ASET image with a moderate amount of this color in an attractive pattern means the diamond has good contrast.
Green is produced by low-angle light, which usually is reflected from walls or other objects in the surrounding area (rather than coming from direct sources). A diamond with a high cut quality may show small amounts of this color around the bezel area of the ASET image.
Note that when Red and Green areas appear mixed together in the center region of the diamond (above the culet) this simply indicates a kind of crossover between the sources of illumination within the realm of the 45° viewing angle.
Black or White appears in areas that do not return light under real-life viewing conditions. If a diamond is well cut, the ASET image will show only very small areas of black or white around the outer edge (and perhaps none).
The ASET evaluation process provided by the AGS Laboratory relies on a reverse mathematical ray tracing analysis that is conducted by a super computer which then evaluates the diamond as seen from more than 200 different degrees of tilt, not just a single static view.
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