What is table percentage? And what should the table percentage be for a princess or cushion cut diamond?

Table percentage is the ratio of the table width as compared to the total width of the diamond. The flat part of the diamond is the major reflector of light, so you want this flat table to be large enough to catch and reflect the light, but also to have a good ratio with the total width of the diamond.
A diamond table percentage that is too low will not have as much brilliance and fire as a diamond that has a higher diamond table percentage. The diamond table percentage in round diamonds should be 53% for maximum brilliance and fire.
For princess, cushion, and emerald cut diamonds, an ideal diamond table percentage is 75 to 80%, while other cuts should have an ideal diamond table percentage of 53 to 58%.

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