How diamond cut grades are assigned.
Ideal cut grade diamond.
The closer the diamond matches to the ideal benchmark the higher the cut grade.
Although its facet count is invariable its proportions are not.
Gia diamond cut grading system.
This cut represents roughly the top 15 of diamond cut quality it reflects nearly as much light as the ideal cut but for a lower price.
Gia assigns a cut grade anywhere from excellent maximum light return creating exceptional sparkle and life to poor light entering the diamond escape from.
The gia diamond cut grading system assigns one of these five grades to describe the overall cut quality of a standard round brilliant diamond in the gia d to z color range and the flawless to i 3 clarity range.
This rare cut represents roughly the top 3 of diamond cut quality it reflects most of the light that enters the diamond.
To determine the cut grade of the standard round brilliant diamond the shape that dominates the majority of diamond jewelry gia calculates the proportions of those facets that influence the diamond s face up appearance.
Each cut grade represents a range of proportion sets and diamond appearances each of which may conform in.
Cut quality is graded by the ags as ideal excellent very good good fair or poor.
American gem society taking cut grading to a higher level.
The strictest standards are applied to the round brilliant.
The ags diamond cut grade chart also includes an ideal grade.
An ideal cut diamond reflects close to 100 of the light that enters through the table and crown facets.
A diamond s cut is evaluated by trained graders with higher grades given to stones whose symmetry and proportions most closely match the particular ideal used as a benchmark.
Ags indicates the proportion factors grade if the overall cut grade isn t ags ideal o simply for documentation purposes.
Excellent very good good fair poor.
Conversely a well cut diamond can have a slightly lower color g h or clarity si1 si2 and still look quite beautiful due to its superior ability to create sparkle and.
To the observer this reflected light is seen fire brilliance and scintillation.
Basically even if your diamond has ideal light return it can still receive low proportions grade if the crown angle is too high or the table is too big or some other proportion factor like pavilion angle culet size.
A diamond s cut is evaluated by trained graders who assess a stone s symmetry and proportions and assign a cut grade based on how closely the diamond matches the particular ideal cut used as a benchmark.
Blue nile offers four different cut grades ideal.
When looking at ags diamonds we recommend only considering ideal cut diamonds for the best quality.
And of all the diamond 4cs it is the most complex and technically difficult to analyze.
