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Table width is quoted as a percentage
of the average width of the diamond's girdle. Table size is less
critical to the beauty of a diamond than variations in the crown
and especially pavilion angle. AGS and GIA's new systems each
have top grades that include 61% table sizes.
Yields from most rough diamonds are improved by polishing larger
table sizes than we might prefer. Small variances in crown and
pavilion angles cause less problems if table sizes are in the
range of 55% to 58%.
Larger table diamonds have a better "spread" and can
be brighter, i.e. they return more light, but are often less firey
than diamonds with smaller tables. They often have less scintillation.
Larger table sizes are considered to be an advantage in smaller
diamonds below .10 ct.
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