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