cut grade reference chart - diamonds & diamond grading final exam, Questions and Correct Answers. Complete Solution 2024

cut grade reference chart - diamonds &
diamond grading final exam, Questions and
Correct Answers. Complete Solution 2024
an excellent cut grade diamond has a brightness level of
very bright
the pattern of an excellent cut grade diamond has (3 things)
no pattern defects
- even pattern of bright & dark areas with strong contrast
- symmetrical pattern of dark radiating mains is allowed within the table if the area
around the culet remains bright
an excellent cut grade diamond has _____ fire
high
how overweight can a diamond be to have an excellent cut grade
up to 9% overweight
the total depth % of an excellent cut grade diamond is
57.5 - 63%
the table % of an excellent cut grade diamond is
52 - 62%
the star length % of an excellent cut grade diamond is
45 - 65%
the crown angle of an excellent cut grade diamond is
31.5° - 36.5°
the crown height % for an excellent cut grade diamond is
12.5 - 17%
the culet size for an excellent cut grade diamond is
none to small
the pavilion angle for an excellent cut grade diamond is
40.6° - 41.8°
lower half length % for an excellent cut grade diamond is
70 - 85%
Girdle thickness % for an excellent cut grade diamond is
2.5 - 4.5%
Girdle thickness description for an excellent cut grade diamond is
THN - STK
painting and digging out on an excellent cut grade diamond is
negligible (insignificant, not worth considering)
the polish of an excellent cut grade diamond is
excellent to very good
the symmetry for an excellent cut grade diamond is
excellent to very good
the combined effect of proportions of cut grade for diamond is

, proportions can always combine to negatively affect appearance and cause a lower cut
grade
the brightness of a very good cut grade diamond is
bright
the pattern of a very good cut grade diamond has ( 2 things)
minor pattern defects
- slight darkening of mains and along upper half facets
the fire of a very good cut grade diamond is
high to moderate
a very good cut grade diamond can be overweight by
up to 16%
the total depth % of a very good cut grade diamond is
56 - 64.5 %
the table % of a very good cut grade diamond is
50 - 66%
star length % of a very good cut grade diamond is
40 - 70%
the crown angle of a very good cut grade diamond is
26.5° - 38.5°
crown height % of a very good cut grade diamond is
10.5 - 18%
the culet size of very good cut grade diamond is
none to medium
the pavilion angle of a very good cut grade diamond is
39.8° - 42.4°
lower half length % of a very good cut grade diamond is
65 - 90%
girdle thickness % of a very good cut grade diamond can be up to
5.5%
girdle thickness description of a very good cut grade diamond is
VTN to THK
painting and digging out on a very good cut grade diamond is
negligible (insignificant) to moderate
the polish of a very good cut grade diamond is
excellent to good
the symmetry of a very good cut grade diamond is
excellent to good
the brightness of a good cut grade diamond has
some dark areas that detract from stone's appearance
the pattern of a good cut grade diamond has (4 things)
noticeable pattern defects
- dark mains extend under the crown facets and distract from appearance
- slight dark ring within the table
-somewhat dark upper half facets
the fire of a good cut grade diamond is
moderate