When looking at ags diamonds we recommend only considering ideal cut diamonds for the best quality.
Ideal cut grade diamond.
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.
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.
An ideal cut diamond reflects close to 100 of the light that enters through the table and crown facets.
Excellent very good good fair poor.
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.
The ags diamond cut grade chart also includes an ideal grade.
Gia diamond cut grading system.
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.
This rare cut represents roughly the top 3 of diamond cut quality it reflects most of the light that enters the diamond.
And of all the diamond 4cs it is the most complex and technically difficult to analyze.
As a diamond deviates further from having ideal light performance so does the numerical grading value as it starts increasing from 1 excellent 2 very good.
Gia assigns a cut grade anywhere from excellent maximum light return creating exceptional sparkle and life to poor light entering the diamond escape from.
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.
How diamond cut grades are assigned.
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.
To the observer this reflected light is seen fire brilliance and scintillation.
Ags diamond quality document ags was the first independent grading organization to utilize a numerical system in their reports with 0 being the highest grade.
Although its facet count is invariable its proportions are not.
Ags indicates the proportion factors grade if the overall cut grade isn t ags ideal o simply for documentation purposes.
The strictest standards are applied to the round brilliant.
The closer the diamond matches to the ideal benchmark the higher the cut grade.
Blue nile offers four different cut grades ideal.
Cut grade is the most important factor in determining the overall appearance of a diamond because a poorly cut diamond will seem dull even with excellent clarity and color.
