The GIA cut grade is assigned as:
Seven factors are considered to produce this cut grade:
Brightness: the total of all internal and external reflections of white light.
Fire: the angled facets of a diamond work together to break white light into the spectral colors.
Scintillation: the combined effect of the sparkle and pattern of a diamond.
Weight Ratio: the comparison of a diamond's weight to it's diameter. A diamond should be neither too heavy nor too light for the diameter.
Durability: the potential risk for damage due to overly thin girdles or points.
Polish: the extent to which facets are finished without visible signs of cutting and polishing.
Symmetry: the exactness of the diamond's shape based on even proportions, and facet placement.
Through extensive research the GIA has evaluated the result on the appearance of a diamond based on the many different variations of diamond proportions. The following measurements are all considered to produce a resulting grade: table size, crown angle, pavilion angle, culet size, star facet length, lower half facet length, girdle thickness percentage, crown height and total depth.
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