SHAPE: In addition to the traditional Round Brilliant shape, the most common Fancy Shapes are: Oval, Pear, Marquise, Princess, Radiant, Emerald and Heart. See the chart below! Less common shapes include Trillion (or Triangular), Flanders and Asscher.
TABLE and DEPTH: Percentage are two critical measurements for loose diamonds. The angles of cut will affect a diamond's natural ability to both reflect and refract light - that is, the diamond's ability to virtually explode with brilliance. If a diamond is cut too deep, light leaks out the sides, brilliance is lost and the center of the diamond will appear to be dark. If a diamond is cut too shallow, light leaks out the bottom and the diamond appears watery, glassy and dark. If the proportions are good, the sides and bottom of the diamond will all reflect their light back out the top of the diamond, which creates the brilliance diamonds are famous for.
The TABLE percent is the width of the top facet of the crown compared to the diamond's total width. Table width between 53% and 64% are considered Preferred in Round Brilliant Cut diamonds. The DEPTH percent is the total depth or height of the diamond compared to the total width. Depth measurements between 58% and 63% are considered Preferred in Round Brilliant Cut Diamonds. The Preferred range for these measurements will change as the shape changes, i.e. a Marquise cut diamond will have different ranges for Premium Table and Depth percentages.
| SHAPE | TABLE Percentage | DEPTH Percentage |
| Round | 56% to 62% | 58% to 62% |
| Oval | 56% to 60% | 60% to 64% |
| Marquise | 56% to 60% | 60% to 64% |
| Pear | 56% to 60% | 60% to 65% |
| Heart | 56% to 62% | 52% to 58% |
| Emerald | 60% to 65% | 62% to 65% |
| Radiant | 65% to 69% | 63% to 67% |
| Princess | 65% to 69% | 63% to 67% |
