There are many different types of cuts, each has it's own beauty.
These are examples of some of the most popular cuts
This is an illustration of how light reflects from the basic round cuts.
The Gemological Institute of America (GIA) has developed guidelines for grading the make of round brilliant cut diamonds only.
 |
| KEY FACTORS | Class 1 "Ideal" Cut | Class 2 Well Cut | Class 3 Cut Average | Class 4 Cut Below Avrg |
| Table Size |
53-60% of
diameter |
61-64% |
65-70% |
over
70% |
| Depth |
58-63% of
diameter |
57-64% |
56-66% |
under 56%
over 66% |
| Crown Angles |
34-35
degrees |
32-34
degrees. |
30-32
degrees |
less than 30
degrees |
| Girdle Thickness |
medium -
slightly thick |
thin-thick |
thin or very
thick |
knife edge or
very thick+ |
| Polish & Symmetry |
very good -
excellent |
good |
fair |
poor |