THE GCAL 8X® ULTIMATE DIAMOND CUT GRADING SYSTEM
ENCOMPASSES ALL ASPECTS OF DIAMOND CUT QUALITY ASSESSMENT
The first three of the 8X grading factors analyze the exactness of the physical surface, the facet shapes, as well as the angles.
Skill and time are required to produce a well polished diamond. GCAL gemologists examine every facet to ensure it is free of polish marks, burns and scratches
Master cutters identically shape each facet around the diamond and ensure they are perfectly aligned. Only diamonds with precision faceting achieve a GCAL Excellent.
Optical scanning technology measures each facet and angle to produce an accurate, to-scale diagram of every diamond.
|Table % :||63% - 70%|
|Depth % :||66% - 75%|
|Crown Height :||10% - 15%|
|Pavilion Angle 1 :||570 - 650|
|Pavilion Angle 2 :||360 - 400|
|Pavilion Angle Difference:||200 - 280|
|Length to Width Ratio :||1.00 - 1.015|
|Girdle Thickness :||Thin - Thick|
|Culet Size :||None - Very Small|
The next three of the 8X grading factors analyze the light handling ability of your diamond. The combination ofthese factors is the essence of what makes any diamond visibly shine, dance and sparkle from across a room.
is the overall return of white light to the viewer. It is measured to the thousandth decimal place and is represented in this image. The white areas indicate light return/brilliance, and the dark blue areas indicate light loss.
The last two 8X grading factors scrutinize the craftsmanship of the shape and the precise alignment of the crown and pavilion facets to achieve aesthetic perfection.
is visualized in this photograph of your diamond taken in a specific colored lighting environment. The evenness of the pattern illustrates the precision and uniformity of facet shapes and alignment.
The angles and axis symmetry are measured to confirm 8X® princess cuts are desirable square shapes, with a ratio between 1 to 1.015 and 90˚ corners within 0.20+/-. The axis symmetry images shown here are part of these measurements.
Precise points or chamfered corners on princess cuts are inspected to ensure only diamonds with undamaged corners, at the time of certification, achieve an Excellent grade.