Table size is the width of the table as a percentage of the average diameter.
In more detail
GIA's Excellent limit for the table alone is 52 to 62%. GIA also grades it together with the crown and pavilion angles. At the same crown angle, a bigger table makes a lower crown and a shallower stone. Bigger is not automatically brighter.
On a grading report
On the proportion diagram as "table". IGI's Ideal band is 53 to 60%.
Related terms
- Table: The table is the large flat facet on top of a cut stone, an octagon on a round brilliant. Much of the light enters through it.
- Crown height: Crown height is the height of the crown, from the girdle to the table. It is a percentage of the average diameter.
- Crown angle: The crown angle is the slope of the bezel facets, measured against the plane of the girdle.
- Cut grade: The cut grade rates how well a diamond's proportions and finish work, from Excellent to Poor. GIA gives it only to standard round brilliants in the D-to-Z color range.
- Ideal cut: "Ideal cut" has three meanings: an IGI comment, a GIA supplement grade, or a sales word. At IGI it marks an Excellent round with narrower proportions; at GIA it appears only as "AGS Ideal".