BijanDiamonds.com Dictionary
Table:
The table percentage is the diameter of the top facet (or table) compared to the diamond's width. For a diamond with the most sparkle and fire, we recommend a diamond in which the table measures between 51% and 65% of the total diamond width. These measurements are stated on the diamond certificate. Example: If the table equals 5mm, and the width equals 9mm, 5 divided by 9 = 55%, which qualifies as ideal table percentage.