Emerald Table Percentage:

The table directly affects scintillation, or sparkle in a diamond. The combination of table size and crown angle governs the balance between brilliance, flashes of white light returning to the eye from within the diamond and dispersion, the play of spectral colors seen by the eye created by refracted light as it prisms through a diamond's facets. Emerald cut diamonds with table percentages under 75% look the best. Emerald cut diamonds with table percentages below 70% are more rare and deliver  even greater brilliance.

GIA has not established ideal table measurements for emerald cut diamonds, but diamonds within the above table percentage ranges have consistently proven to deliver greater brilliance and beauty. The brilliance of your diamond depends on proper cutting. Certified-Plus Diamonds selects only ideal to premium cut diamonds to ensure that the diamond you choose will be as brilliant as it is beautiful. A diamond with these premium proportions will cost more, but its brilliance is well worth the added investment.