Oval Table Percentage:

The table is the large flat facet on the crown or top of a diamond. 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.
 

GIA has not established ideal table measurement percentages for oval cut diamonds. But, oval cut diamonds with table percentages that measure below 62 percent or less deliver exceptional brilliance. Oval diamonds within this range are usually preferred for their better balance of sparkle. Table measurements that are within these ranges are considered by Gemologists to have very fine table proportions. Generally oval diamonds have table percentages in the 52% to 62% range. Larger tables are not as common in oval diamonds as they are in other cuts. 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. Our Certified Gemologist-Appraisers will be happy to assist you in selecting the most brilliant oval cut diamond possible.