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Cut

MAKING THE

CUT


  • SHALLOW


  • IDEAL


  • DEEP



Whatever shape a rough diamond has been polished into, the cut determines the diamond’s brilliance, light dispersion and scintillation.

For this reason, the cut plays an important role in determining the price of the stone; therefore it is better to acquaint yourself with all the factors affecting the cut of stone before making purchase.


THE DIAMOND
STRUCTURE



  • A diamond is made up of two key sections, the Crown and the Pavilion.

  • Their structure and relationship to each other in the form of table and depth percentage have the biggest impact on the diamond’s sparkle.

  • The round brilliant cut has been used as an example, because with most other diamond shapes (fancy cut diamonds) the cut grading is more complicated (hence the cut grading does not appear on certificates such as GIA.)

1-5 CROWN

Top part between the girdle and table

6-8PAVILION

Bottom part between the girdle and culet

ADDITIONAL TERMS

DIAMETER
Width of the diamond at the widest point of the girdle (in fancy cut diamonds, the smallest diameter is used).
DEPTH
Height from the table to the culet.

CUT GRADING

The cut is mainly influenced by the harmony between the table and depth percentages and crown and pavilion angels, either causing the diamond to dissipate light (poor cut) or optimally refract and reflect light (excellent cut).

HOW THEY'RE CALCULATED

DEPTH(%) =


DEPTH (MM)
AVERAGE GIRDLE DIAMETER (MM)
DEPTH PERCENTAGE
The higher the number, the deeper the stone.
The lower the number, the shallower the stone.
TABLE(%) =
LONGEST TABLE MEASUREMENT(MM)
AVERAGE GIRDLE DIAMETER (MM)
TABLE PERCENTAGE
The higher the number, the bigger the table looks.
The lower the number, the smaller the table looks.

GIA have developed a grading system, which take these and other important factors into account to provide a scientific assessment of a diamond’s sparkle.

At Michael Trio uses the GIA classification of Excellent, Very Good, Good, Fair and Poor grades to help customers assess diamond quality.