For Gemstone the CUT grade is the third most important factor for evaluating colored Gemstones. However, the cut can positively or adversely affect the color grade of a gemstone as well. In addition, designer cut Gemstones will add a premium to the overall value. Proportions taken in account are as follows: Outline balance, length to width ratio, profile balance, total depth percentage, crown height and pavilion depth, bulge, table size and brilliance.

 Extra Fine: Excellent proportions and finish, length to width ratio in preferred range, table size and girdle thickness in preferred range, polish and symmetry very good to excellent.

 Fine: Very good proportions and finish, length to width ratio should still be in preferred range or very close to it, table size and girdle thickness close to preferred range, polish and symmetry good to very good.

 Good: Good proportions and finish, length to width ratio may be out of preferred range, table and girde may be out of preferred range, polish and symmetry fair to good.

 Fair: Poor to fair proportions and finish, length to width ratio undesirable, obviously large table and girdle, polish and symmetry poor to fair.
Like the rest of the Four Cs, cut influence on value is directly related to its rarity.

As you read about other THREE of the Four Cs (Color & Clarity), you will see how Cut plays an important role in Gemstone certification.

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